Toggle on and the trainer will try to keep your stamina bar from falling. Toggle on and the trainer will try to mitigate any damage to your character. Toggle on and the trainer keeps your Health, Stamina, and DeadEye at max, as well as max for the horse. Multiply: Unlimited Max Horse Health Core NumPad9: Unlimited Max Horse Stamina Core
All hotkeys can be changed on the trainer. If not state otherwise below, press F1 at main menu.