diff --git a/src/physics.rs b/src/physics.rs
index 0af0b19..4b962be 100644
--- a/src/physics.rs
+++ b/src/physics.rs
@@ -46,6 +46,7 @@ pub enum PhysicsInputInstruction {
 		//Idle: there were no input events, but the simulation is safe to advance to this timestep
 		//for interpolation / networking / playback reasons, most playback heads will always want
 		//to be 1 instruction ahead to generate the next state for interpolation.
+	PracticeFly,
 }
 
 #[derive(Clone,Copy,Debug,Default,Hash)]
@@ -1484,6 +1485,18 @@ fn run_teleport_behaviour(wormhole:&Option<gameplay_attributes::Wormhole>,models
 						state.move_state=MoveState::Air;
 						//b_refresh_walk_target will figure out gravity and stuff
 					},
+					PhysicsInputInstruction::PracticeFly=>{
+						match &state.move_state{
+							MoveState::Fly=>{
+								state.move_state=MoveState::Air;
+								state.body.acceleration=state.style.gravity;
+							},
+							_=>{
+								state.move_state=MoveState::Fly;
+								state.body.acceleration=Planar64Vec3::ZERO;
+							},
+						}
+					},
 					PhysicsInputInstruction::Idle=>{b_refresh_walk_target=false;},//literally idle!
 				}
 				if b_refresh_walk_target{
diff --git a/src/physics_worker.rs b/src/physics_worker.rs
index 37196e1..1f0e970 100644
--- a/src/physics_worker.rs
+++ b/src/physics_worker.rs
@@ -13,6 +13,7 @@ pub enum InputInstruction{
 	Jump(bool),
 	Zoom(bool),
 	Reset,
+	PracticeFly,
 }
 pub enum Instruction{
 	Input(InputInstruction),
@@ -62,6 +63,7 @@ pub enum Instruction{
 					&InputInstruction::Jump(s)=>Some(PhysicsInputInstruction::SetJump(s)),
 					&InputInstruction::Zoom(s)=>Some(PhysicsInputInstruction::SetZoom(s)),
 					InputInstruction::Reset=>Some(PhysicsInputInstruction::Reset),
+					InputInstruction::PracticeFly=>Some(PhysicsInputInstruction::PracticeFly),
 				},
 				Instruction::GenerateModels(_)=>Some(PhysicsInputInstruction::Idle),
 				Instruction::ClearModels=>Some(PhysicsInputInstruction::Idle),
diff --git a/src/window.rs b/src/window.rs
index 3421469..08ed102 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -108,6 +108,7 @@ impl WindowContext<'_>{
 								"q"=>Some(InputInstruction::MoveDown(s)),
 								"z"=>Some(InputInstruction::Zoom(s)),
 								"r"=>if s{Some(InputInstruction::Reset)}else{None},
+								"f"=>if s{Some(InputInstruction::PracticeFly)}else{None},
 								_=>None,
 							},
 							_=>None,