The skills (jump, grab, flip, etc) will be built up, as in an rpg. The more you use them, the better you will get at them.
For example: If you never use your backflip, but you come across a chasm that requires a backflip level of 3 and yours is only at 1, then guess what?? YOU AIN\'T GETTING TO THAT CLIFF!!! Hahaha...
(of course the skill numbers I made up to illustraight the point)
In the interview it\'s stated that without "building up" skills the player will only get about 60% of the game, but can still finish it.