diff --git a/code/foundation/src/models/components.h b/code/foundation/src/models/components.h
index ac24ea2..9df038d 100644
--- a/code/foundation/src/models/components.h
+++ b/code/foundation/src/models/components.h
@@ -38,6 +38,9 @@ typedef struct {
 typedef Vector2D Position;
 typedef Vector2D Velocity;
 
+typedef struct { char _unused; } InAir;
+typedef struct { char _unused; } TriggerOnly;
+
 enum {
 	PHYS_CIRCLE,
 	PHYS_AABB,
@@ -250,6 +253,8 @@ typedef struct {
 	X(Vector2D)\
 	X(Position)\
 	X(Velocity)\
+	X(InAir)\
+	X(TriggerOnly)\
 	X(PhysicsBody)\
 	X(Chunk)\
 	X(Drawable)\
diff --git a/code/foundation/src/systems/systems.c b/code/foundation/src/systems/systems.c
index 12bd7cf..e1addd7 100644
--- a/code/foundation/src/systems/systems.c
+++ b/code/foundation/src/systems/systems.c
@@ -361,10 +361,10 @@ void SystemsImport(ecs_world_t *ecs) {
 	ECS_OBSERVER(ecs, OnDead, EcsOnAdd, components.Dead);
     
 	// collisions and movement physics
-	ECS_SYSTEM(ecs, ApplyWorldDragOnVelocity, EcsOnUpdate, components.Position, components.Velocity);
+	ECS_SYSTEM(ecs, ApplyWorldDragOnVelocity, EcsOnUpdate, components.Position, components.Velocity, !components.InAir, !components.TriggerOnly);
 	ECS_SYSTEM(ecs, VehicleHandling, EcsOnUpdate, components.Vehicle, components.Position, components.Velocity);
-	ECS_SYSTEM(ecs, BodyCollisions, EcsOnUpdate, components.Position, components.Velocity, components.PhysicsBody);
-	ECS_SYSTEM(ecs, BlockCollisions, EcsOnValidate, components.Position, components.Velocity);
+	ECS_SYSTEM(ecs, BodyCollisions, EcsOnUpdate, components.Position, components.Velocity, components.PhysicsBody, !components.TriggerOnly);
+	ECS_SYSTEM(ecs, BlockCollisions, EcsOnValidate, components.Position, components.Velocity, !components.TriggerOnly);
 	ECS_SYSTEM(ecs, IntegratePositions, EcsOnValidate, components.Position, components.Velocity);
     
 	// vehicles