I dont know if you are serious or not so I will say this, it depends what type of bears... If getting attack by black bears you should fight back, but grizzly bears you should play dead... Before that point it would be to look as big as possible and yell loud (don't need to say whoa bear they don't understand English lol) if he doesn't care about you fall back slowly and leave but if he comes towards you by interest, hold your ground yell and make yourself look big ... the biggest thing with predators is to not act like a prey or they would pursue you.