The way I learned to get my bike up on stuff wa to watch my cat jump onto things. Squirrels work too, at least for me they do. The way a cat bunches up it's hind legs and muscles before jumping, thats kinda what I keep in mind before hopping up onto a log or ledge or what have you. I know it sounds silly because every time I say this out loud in a conversation, somone laughs at me.