Flexibility. Strength. Confidence. "If you don't use it you lose it!" For me, this statement brings up images of elderly people struggling to get out of chairs or up and down stairs. Imagine how they would move if they never assumed they couldn't move?
I'll say it again...
Children are on the total opposite end of the spectrum. They have no fear, they will move however they want to. If you look at a toddler, they can squat perfectly. They haven't been restrained by chairs for 30+ years...