diff --git a/include/physics.h b/include/physics.h
index a85f9a8..e50a224 100644
--- a/include/physics.h
+++ b/include/physics.h
@@ -5,12 +5,12 @@
 #include <math.h>
 
 // Tunable constants
-#define PHYS_GRAVITY            -0.1f
-#define PHYS_TERMINAL_VELOCITY  -10.0f
+#define PHYS_GRAVITY            -0.01f // ok
+#define PHYS_TERMINAL_VELOCITY  -20.0f
 #define PHYS_GROUND_FRICTION     0.96f
-#define PHYS_AIR_FRICTION        0.985f
-#define PHYS_MAX_AIR_SPEED       4.0f
-#define PHYS_SLOPE_SLIDE_FACTOR  0.05f
+#define PHYS_AIR_FRICTION        3.985f
+#define PHYS_MAX_AIR_SPEED       1.0f
+#define PHYS_SLOPE_SLIDE_FACTOR  0.03f
 
 void physics_apply(Entity *self, Uint8 onGround, Uint8 ignoreGravity);
 void physics_apply_slope(Entity *self, GFC_Vector3D groundNormal, Uint8 onGround);
diff --git a/src/player.c b/src/player.c
index 4f08eb3..3b2e342 100644
--- a/src/player.c
+++ b/src/player.c
@@ -4,14 +4,14 @@
 #include "world.h"
 
 // Constants
-#define PLAYER_RADIUS        	1.0f
+#define PLAYER_RADIUS        	2.0f
 #define DOWN_RAY_ABOVE       	1.0f
 #define DOWN_RAY_BELOW       	2.0f
 #define PENETRATION_TOLERANCE 	0.05f
 #define REST_TOLERANCE       	0.02f
 
-#define JUMP_STRENGTH        	2.0f
-#define MOVE_SPEED           	0.5f
+#define JUMP_STRENGTH        	0.5f
+#define MOVE_SPEED           	0.0001f
 
 static Entity* thePlayer;