Bear Hug: A man once escaped a bear attack when he locked his arms and legs around the bear in a reverse bear hug, which made it confused and it ran off. If you're on your back and the bear is on you, it might be your last resort.
Calm The Charge: While it may be the last thing on your mind, calmly standing your ground when a bear is charging can be the best attack deflector. If you get a bluff attack as a warning, stand, wave your hands, and talk calmly to the bear.
Play Dead: Okay, this doesn't work when a bear has stalked and attacked you, but will work with bears protecting their cubs or territory. So if you are a lover, not a fighter, play dead.
Go Sideways: Because of the bear's huge upper body and neck muscles, rotating their heads side-to-side is difficult. Keep moving to the side to make it harder for them to see you... or see your attack on them.
Space Blanket: It may just seem like a thin, shiny piece of plastic, but it can keep you from going into shock and also from freezing to death.