diff --git a/azalea-client/src/client.rs b/azalea-client/src/client.rs
index af5354159..87aece2c9 100644
--- a/azalea-client/src/client.rs
+++ b/azalea-client/src/client.rs
@@ -30,7 +30,7 @@ use azalea_core::{position::Vec3, tick::GameTick};
 use azalea_entity::{
     indexing::{EntityIdIndex, EntityUuidIndex},
     metadata::Health,
-    EntityPlugin, EntityUpdateSet, EyeHeight, LocalEntity, Position,
+    EntityPlugin, EntityUpdateSet, EyeHeight, LocalEntity, Position, Sneaking,
 };
 use azalea_physics::PhysicsPlugin;
 use azalea_protocol::{
@@ -640,6 +640,7 @@ pub struct JoinedClientBundle {
     pub permission_level: PermissionLevel,
     pub chunk_batch_info: ChunkBatchInfo,
     pub hunger: Hunger,
+    pub sneaking: Sneaking,
 
     pub entity_id_index: EntityIdIndex,
 
diff --git a/azalea-client/src/local_player.rs b/azalea-client/src/local_player.rs
index b0582d8ba..fdee00c31 100644
--- a/azalea-client/src/local_player.rs
+++ b/azalea-client/src/local_player.rs
@@ -47,21 +47,6 @@ pub struct LocalGameMode {
     pub previous: Option<GameMode>,
 }
 
-/// A component that contains the abilities the player has, like flying
-/// or instantly breaking blocks. This is only present on local players.
-#[derive(Clone, Debug, Component, Default)]
-pub struct PlayerAbilities {
-    pub invulnerable: bool,
-    pub flying: bool,
-    pub can_fly: bool,
-    /// Whether the player can instantly break blocks and can duplicate blocks
-    /// in their inventory.
-    pub instant_break: bool,
-
-    pub flying_speed: f32,
-    /// Used for the fov
-    pub walking_speed: f32,
-}
 impl From<&ClientboundPlayerAbilitiesPacket> for PlayerAbilities {
     fn from(packet: &ClientboundPlayerAbilitiesPacket) -> Self {
         Self {
diff --git a/azalea-client/src/movement.rs b/azalea-client/src/movement.rs
index ba47b7c84..6e61ade42 100644
--- a/azalea-client/src/movement.rs
+++ b/azalea-client/src/movement.rs
@@ -1,9 +1,12 @@
 use crate::client::Client;
+use crate::inventory::InventoryComponent;
+use crate::local_player::PlayerAbilities;
 use crate::packet_handling::game::SendPacketEvent;
 use azalea_core::position::Vec3;
 use azalea_core::tick::GameTick;
+use azalea_entity::metadata::{ShiftKeyDown, Sleeping, SleepingPos, Swimming};
 use azalea_entity::{metadata::Sprinting, Attributes, Jumping};
-use azalea_entity::{InLoadedChunk, LastSentPosition, LookDirection, Physics, Position};
+use azalea_entity::{InLoadedChunk, LastSentPosition, LookDirection, Physics, Position, Sneaking};
 use azalea_physics::{ai_step, PhysicsSet};
 use azalea_protocol::packets::game::serverbound_player_command_packet::ServerboundPlayerCommandPacket;
 use azalea_protocol::packets::game::{
@@ -12,10 +15,11 @@ use azalea_protocol::packets::game::{
     serverbound_move_player_rot_packet::ServerboundMovePlayerRotPacket,
     serverbound_move_player_status_only_packet::ServerboundMovePlayerStatusOnlyPacket,
 };
-use azalea_world::{MinecraftEntityId, MoveEntityError};
+use azalea_world::{InstanceContainer, InstanceName, MinecraftEntityId, MoveEntityError};
 use bevy_app::{App, Plugin, Update};
 use bevy_ecs::prelude::{Event, EventWriter};
 use bevy_ecs::schedule::SystemSet;
+use bevy_ecs::system::Res;
 use bevy_ecs::{
     component::Component, entity::Entity, event::EventReader, query::With,
     schedule::IntoSystemConfigs, system::Query,
@@ -57,11 +61,13 @@ impl Plugin for PlayerMovePlugin {
             .add_systems(
                 GameTick,
                 (
-                    (tick_controls, local_player_ai_step)
+                    (update_sneaking, tick_controls, local_player_ai_step)
                         .chain()
                         .in_set(PhysicsSet)
                         .before(ai_step),
-                    send_sprinting_if_needed.after(azalea_entity::update_in_loaded_chunk),
+                    (send_sprinting_if_needed, send_shift_key_down_if_needed)
+                        .chain()
+                        .after(azalea_entity::update_in_loaded_chunk),
                     send_position.after(PhysicsSet),
                 )
                     .chain(),
@@ -117,7 +123,7 @@ pub struct LastSentLookDirection {
     pub y_rot: f32,
 }
 
-/// Component for entities that can move and sprint. Usually only in
+/// Component for entities that can move, sprint, and sneak. Usually only in
 /// [`LocalEntity`]s.
 ///
 /// [`LocalEntity`]: azalea_entity::LocalEntity
@@ -126,7 +132,15 @@ pub struct PhysicsState {
     /// Minecraft only sends a movement packet either after 20 ticks or if the
     /// player moved enough. This is that tick counter.
     pub position_remainder: u32,
+
     pub was_sprinting: bool,
+
+    /// Whether the player was sneaking last tick. You shouldn't modify this.
+    ///
+    /// If you want to check or change the player's sneak state from the ECS,
+    /// use the [`ShiftKeyDown`] component.
+    pub was_sneaking: bool,
+
     // Whether we're going to try to start sprinting this tick. Equivalent to
     // holding down ctrl for a tick.
     pub trying_to_sprint: bool,
@@ -251,10 +265,11 @@ fn send_sprinting_if_needed(
     mut query: Query<(Entity, &MinecraftEntityId, &Sprinting, &mut PhysicsState)>,
     mut send_packet_events: EventWriter<SendPacketEvent>,
 ) {
-    for (entity, minecraft_entity_id, sprinting, mut physics_state) in query.iter_mut() {
+    for (entity, &minecraft_entity_id, &Sprinting(sprinting), mut physics_state) in query.iter_mut()
+    {
         let was_sprinting = physics_state.was_sprinting;
-        if **sprinting != was_sprinting {
-            let sprinting_action = if **sprinting {
+        if sprinting != was_sprinting {
+            let sprinting_action = if sprinting {
                 azalea_protocol::packets::game::serverbound_player_command_packet::Action::StartSprinting
             } else {
                 azalea_protocol::packets::game::serverbound_player_command_packet::Action::StopSprinting
@@ -262,22 +277,122 @@ fn send_sprinting_if_needed(
             send_packet_events.send(SendPacketEvent {
                 entity,
                 packet: ServerboundPlayerCommandPacket {
-                    id: **minecraft_entity_id,
+                    id: *minecraft_entity_id,
                     action: sprinting_action,
                     data: 0,
                 }
                 .get(),
             });
-            physics_state.was_sprinting = **sprinting;
+            physics_state.was_sprinting = sprinting;
+        }
+    }
+}
+
+fn send_shift_key_down_if_needed(
+    mut query: Query<(Entity, &MinecraftEntityId, &ShiftKeyDown, &mut PhysicsState)>,
+    mut send_packet_events: EventWriter<SendPacketEvent>,
+) {
+    for (entity, &minecraft_entity_id, &ShiftKeyDown(sneaking), mut physics_state) in
+        query.iter_mut()
+    {
+        let was_sneaking = physics_state.was_sneaking;
+        if sneaking != was_sneaking {
+            let sneaking_action = if sneaking {
+                azalea_protocol::packets::game::serverbound_player_command_packet::Action::PressShiftKey
+            } else {
+                azalea_protocol::packets::game::serverbound_player_command_packet::Action::ReleaseShiftKey
+            };
+            send_packet_events.send(SendPacketEvent {
+                entity,
+                packet: ServerboundPlayerCommandPacket {
+                    id: *minecraft_entity_id,
+                    action: sneaking_action,
+                    data: 0,
+                }
+                .get(),
+            });
+            physics_state.was_sneaking = sneaking;
         }
     }
 }
 
+fn can_player_fit_within_blocks_and_entities_when(
+    _pose: azalea_entity::Pose,
+    _position: Vec3,
+    _instance: &azalea_world::Instance,
+) -> bool {
+    // TODO
+    true
+}
+
+pub fn update_sneaking(
+    mut query: Query<(
+        &PlayerAbilities,
+        &Swimming,
+        // TODO: isPassenger
+        &ShiftKeyDown,
+        &SleepingPos,
+        &Position,
+        &InstanceName,
+        &mut Sneaking,
+    )>,
+    instances: Res<InstanceContainer>,
+) {
+    for (
+        player_abilities,
+        &Swimming(swimming),
+        &ShiftKeyDown(shift_key_down),
+        &SleepingPos(sleeping_pos),
+        &Position(position),
+        instance_name,
+        mut sneaking,
+    ) in query.iter_mut()
+    {
+        let Some(instance) = instances.get(instance_name) else {
+            continue;
+        };
+        // this.crouching = !this.getAbilities().flying
+        // && !this.isSwimming()
+        // && !this.isPassenger()
+        // && this.canPlayerFitWithinBlocksAndEntitiesWhen(Pose.CROUCHING)
+        // && (this.isShiftKeyDown()
+        //       || !this.isSleeping() && !this.canPlayerFitWithinBlocksAndEntitiesWhen(Pose.STANDING));
+
+        let instance = instance.read();
+
+        **sneaking = !player_abilities.flying
+            && !swimming
+            // && !isPassenger
+            // && this.canPlayerFitWithinBlocksAndEntitiesWhen(Pose.CROUCHING)
+            && can_player_fit_within_blocks_and_entities_when(
+                azalea_entity::Pose::Crouching,
+                position,
+                &instance,
+            )
+             && (shift_key_down
+                || (
+                    sleeping_pos.is_none()
+                    && !can_player_fit_within_blocks_and_entities_when(azalea_entity::Pose::Standing, position, &instance)
+                )
+            );
+    }
+}
+
+fn is_moving_slowly(sneaking: bool, is_visually_crawling: bool) -> bool {
+    sneaking || is_visually_crawling
+}
+
 /// Update the impulse from self.move_direction. The multiplier is used for
 /// sneaking.
-pub(crate) fn tick_controls(mut query: Query<&mut PhysicsState>) {
-    for mut physics_state in query.iter_mut() {
-        let multiplier: Option<f32> = None;
+pub(crate) fn tick_controls(mut query: Query<(&mut PhysicsState, &Sneaking, &InventoryComponent)>) {
+    for (mut physics_state, &Sneaking(sneaking), inventory) in query.iter_mut() {
+        let multiplier: Option<f32> = if is_moving_slowly(sneaking, false) {
+            let sneaking_speed_bonus =
+                azalea_entity::enchantments::get_sneaking_speed_bonus(&inventory.inventory_menu);
+            Some(f32::clamp(0.3 + sneaking_speed_bonus, 0., 1.))
+        } else {
+            None
+        };
 
         let mut forward_impulse: f32 = 0.;
         let mut left_impulse: f32 = 0.;
@@ -397,6 +512,27 @@ impl Client {
             direction,
         });
     }
+
+    /// Start or stop sneaking.
+    ///
+    /// ```rust,no_run
+    /// # use azalea_client::{Client, WalkDirection, SprintDirection};
+    /// # use std::time::Duration;
+    /// # async fn example(mut bot: Client) {
+    /// // toggle sneak
+    /// bot.sneak(!bot.sneaking());
+    /// # }
+    /// ```
+    pub fn sneak(&mut self, sneaking: bool) {
+        let mut ecs = self.ecs.lock();
+        let mut sneaking_component = self.query::<&mut ShiftKeyDown>(&mut ecs);
+        **sneaking_component = sneaking;
+    }
+
+    /// Returns whether the player is sneaking.
+    pub fn sneaking(&self) -> bool {
+        *self.component::<ShiftKeyDown>()
+    }
 }
 
 /// An event sent when the client starts walking. This does not get sent for
diff --git a/azalea-client/src/packet_handling/configuration.rs b/azalea-client/src/packet_handling/configuration.rs
index da5ce57fe..1f40d947b 100644
--- a/azalea-client/src/packet_handling/configuration.rs
+++ b/azalea-client/src/packet_handling/configuration.rs
@@ -136,8 +136,9 @@ pub fn process_packet_events(ecs: &mut World) {
                         last_sent_direction: crate::movement::LastSentLookDirection::default(),
                         abilities: crate::local_player::PlayerAbilities::default(),
                         permission_level: crate::local_player::PermissionLevel::default(),
-                        hunger: Hunger::default(),
                         chunk_batch_info: crate::chunks::ChunkBatchInfo::default(),
+                        hunger: Hunger::default(),
+                        sneaking: azalea_entity::Sneaking::default(),
 
                         entity_id_index: EntityIdIndex::default(),
 
diff --git a/azalea-entity/src/data.rs b/azalea-entity/src/data.rs
index b0a05e74d..75d6d9838 100755
--- a/azalea-entity/src/data.rs
+++ b/azalea-entity/src/data.rs
@@ -142,9 +142,19 @@ pub enum Pose {
     Sleeping,
     Swimming,
     SpinAttack,
-    Sneaking,
+    Crouching,
     LongJumping,
     Dying,
+    Croaking,
+    UsingTongue,
+    Sitting,
+    Roaring,
+    Sniffing,
+    Emerging,
+    Digging,
+    Sliding,
+    Shooting,
+    Inhaling,
 }
 
 #[derive(Debug, Clone, McBuf)]
diff --git a/azalea-entity/src/enchantments.rs b/azalea-entity/src/enchantments.rs
index fd238bf2d..542749139 100644
--- a/azalea-entity/src/enchantments.rs
+++ b/azalea-entity/src/enchantments.rs
@@ -1,8 +1,14 @@
+use azalea_registry::Enchantment;
+
 pub fn get_enchant_level(
-    _enchantment: azalea_registry::Enchantment,
+    _enchantment: Enchantment,
     _player_inventory: &azalea_inventory::Menu,
 ) -> u32 {
     // TODO
 
     0
 }
+
+pub fn get_sneaking_speed_bonus(player_inventory: &azalea_inventory::Menu) -> f32 {
+    get_enchant_level(Enchantment::SwiftSneak, player_inventory) as f32 * 0.15
+}
diff --git a/azalea-entity/src/lib.rs b/azalea-entity/src/lib.rs
index dd818c6dc..f444dfd07 100644
--- a/azalea-entity/src/lib.rs
+++ b/azalea-entity/src/lib.rs
@@ -4,7 +4,7 @@ pub mod attributes;
 mod data;
 mod dimensions;
 mod effects;
-mod enchantments;
+pub mod enchantments;
 pub mod metadata;
 pub mod mining;
 mod plugin;
@@ -138,7 +138,7 @@ impl Debug for EntityUuid {
 /// You are free to change this; there's systems that update the indexes
 /// automatically.
 #[derive(Component, Clone, Copy, Debug, Default, PartialEq, Deref, DerefMut)]
-pub struct Position(Vec3);
+pub struct Position(pub Vec3);
 impl Position {
     pub fn new(pos: Vec3) -> Self {
         Self(pos)
@@ -425,6 +425,26 @@ impl FluidOnEyes {
 #[derive(Component, Clone, Debug, PartialEq, Deref, DerefMut)]
 pub struct OnClimbable(bool);
 
+/// A component that indicates whether the player is currently sneaking.
+#[derive(Component, Clone, Deref, DerefMut, Default)]
+pub struct Sneaking(pub bool);
+
+/// A component that contains the abilities the player has, like flying
+/// or instantly breaking blocks. This is only present on local players.
+#[derive(Clone, Debug, Component, Default)]
+pub struct PlayerAbilities {
+    pub invulnerable: bool,
+    pub flying: bool,
+    pub can_fly: bool,
+    /// Whether the player can instantly break blocks and can duplicate blocks
+    /// in their inventory.
+    pub instant_break: bool,
+
+    pub flying_speed: f32,
+    /// Used for the fov
+    pub walking_speed: f32,
+}
+
 // #[cfg(test)]
 // mod tests {
 //     use super::*;
diff --git a/azalea-entity/src/metadata.rs b/azalea-entity/src/metadata.rs
index c73136b3b..73cb24f19 100644
--- a/azalea-entity/src/metadata.rs
+++ b/azalea-entity/src/metadata.rs
@@ -1986,7 +1986,7 @@ impl Default for DolphinMetadataBundle {
                     aggressive: Aggressive(false),
                 },
             },
-            treasure_pos: TreasurePos(Default::default()),
+            treasure_pos: TreasurePos(BlockPos::new(0, 0, 0)),
             got_fish: GotFish(false),
             moistness_level: MoistnessLevel(2400),
         }
@@ -3014,7 +3014,7 @@ impl Default for FallingBlockMetadataBundle {
                 pose: Pose::default(),
                 ticks_frozen: TicksFrozen(0),
             },
-            start_pos: StartPos(Default::default()),
+            start_pos: StartPos(BlockPos::new(0, 0, 0)),
         }
     }
 }
@@ -8604,10 +8604,10 @@ impl Default for TurtleMetadataBundle {
                     abstract_ageable_baby: AbstractAgeableBaby(false),
                 },
             },
-            home_pos: HomePos(Default::default()),
+            home_pos: HomePos(BlockPos::new(0, 0, 0)),
             has_egg: HasEgg(false),
             laying_egg: LayingEgg(false),
-            travel_pos: TravelPos(Default::default()),
+            travel_pos: TravelPos(BlockPos::new(0, 0, 0)),
             going_home: GoingHome(false),
             travelling: Travelling(false),
         }
diff --git a/azalea-inventory/azalea-inventory-macros/src/parse_macro.rs b/azalea-inventory/azalea-inventory-macros/src/parse_macro.rs
index 20c2ddc30..de1ec9723 100644
--- a/azalea-inventory/azalea-inventory-macros/src/parse_macro.rs
+++ b/azalea-inventory/azalea-inventory-macros/src/parse_macro.rs
@@ -1,5 +1,5 @@
 use syn::{
-     braced,
+    braced,
     parse::{Parse, ParseStream, Result},
     Ident, LitInt, Token,
 };
diff --git a/azalea-physics/src/collision/mod.rs b/azalea-physics/src/collision/mod.rs
index 3986dc477..5fb67fa77 100644
--- a/azalea-physics/src/collision/mod.rs
+++ b/azalea-physics/src/collision/mod.rs
@@ -7,6 +7,7 @@ mod world_collisions;
 use std::ops::Add;
 
 use azalea_core::{aabb::AABB, direction::Axis, math::EPSILON, position::Vec3};
+use azalea_entity::{metadata::ShiftKeyDown, PlayerAbilities};
 use azalea_world::{Instance, MoveEntityError};
 use bevy_ecs::world::Mut;
 pub use blocks::BlockWithShape;
@@ -138,6 +139,7 @@ pub fn move_colliding(
     world: &Instance,
     position: &mut Mut<azalea_entity::Position>,
     physics: &mut azalea_entity::Physics,
+    abilities: &PlayerAbilities,
 ) -> Result<(), MoveEntityError> {
     // TODO: do all these
 
@@ -250,6 +252,24 @@ pub fn move_colliding(
     Ok(())
 }
 
+fn maybe_back_off_from_edge(
+    abilities: &PlayerAbilities,
+    movement: &Vec3,
+    mover_type: MoverType,
+    is_shift_key_held: &ShiftKeyDown
+) -> Vec3 {
+    // if (!this.abilities.flying
+    //     && movement.y <= 0.0
+    //     && (moverType == MoverType.SELF || moverType == MoverType.PLAYER)
+    //     && this.isStayingOnGroundSurface()
+    //     && this.isAboveGround()) {
+
+    let is_backing_off = !abilities.flying
+        && movement.y <= 0.
+        && matches!(mover_type, MoverType::Own | MoverType::Player)
+        
+}
+
 fn collide_bounding_box(
     movement: &Vec3,
     entity_bounding_box: &AABB,
diff --git a/azalea-physics/src/lib.rs b/azalea-physics/src/lib.rs
index ed813b569..f2c056451 100644
--- a/azalea-physics/src/lib.rs
+++ b/azalea-physics/src/lib.rs
@@ -335,7 +335,7 @@ fn handle_on_climbable(
 
     // sneaking on ladders/vines
     if y < 0.0
-        && pose.copied() == Some(Pose::Sneaking)
+        && pose.copied() == Some(Pose::Crouching)
         && azalea_registry::Block::from(
             world
                 .chunks
diff --git a/azalea/examples/testbot/commands/movement.rs b/azalea/examples/testbot/commands/movement.rs
index 4957533f2..fb9d6f54c 100644
--- a/azalea/examples/testbot/commands/movement.rs
+++ b/azalea/examples/testbot/commands/movement.rs
@@ -136,11 +136,19 @@ pub fn register(commands: &mut CommandDispatcher<Mutex<CommandSource>>) {
                 tokio::time::sleep(Duration::from_secs_f32(seconds)).await;
                 bot.walk(WalkDirection::None);
             });
-            source.reply(&format!("ok, spriting for {seconds} seconds"));
+            source.reply(&format!("ok, sprinting for {seconds} seconds"));
             1
         })),
     );
 
+    commands.register(literal("sneak").executes(|ctx: &Ctx| {
+        let source = ctx.source.lock();
+        let mut bot = source.bot.clone();
+        bot.sneak(!bot.sneaking());
+        source.reply("ok");
+        1
+    }));
+
     commands.register(literal("north").executes(|ctx: &Ctx| {
         let mut source = ctx.source.lock();
         source.bot.set_direction(180., 0.);
diff --git a/codegen/lib/code/entity.py b/codegen/lib/code/entity.py
index 8fa114307..d22651e84 100644
--- a/codegen/lib/code/entity.py
+++ b/codegen/lib/code/entity.py
@@ -347,7 +347,7 @@ def maybe_rename_field(name: str, index: int) -> str:
         #             _marker: Allay,
         #             parent: AbstractCreatureBundle {
         #                 on_fire: OnFire(false),
-        #                 shift_key_down: ShiftKeyDown(false),
+        #                 sneaking: ShiftKeyDown(false),
         #             },
         #             sprinting: Sprinting(false),
         #             swimming: Swimming(false)
@@ -360,7 +360,7 @@ def maybe_rename_field(name: str, index: int) -> str:
 
         def generate_fields(this_entity_id: str):
             # on_fire: OnFire(false),
-            # shift_key_down: ShiftKeyDown(false),
+            # sneaking: ShiftKeyDown(false),
 
             # _marker
             this_entity_struct_name = upper_first_letter(