Call of Duty 4: Modern Warfare - Games Trainer +4
F1 - No Reload / Infinite Ammo / Infinite Grenades On
F2 - No Reload / Infinite Ammo / Infinite Grenades Off
F3 - Infinite Health On
F4 - Infinite Health Off
Teleport
-F5 - Save Position
-F6 - Restore Position
F7 - Enable Levitation
F8 - Disable Levitation
-End - Toggle Freeze X and Y Axis
You can enable F3 when you die to come back to life. You should save a teleport location before you use levitate because you could get stuck in a wall from levitating too much If restoring your teleport position does't work you have to hold the key down until it teleports you.