Quoting MommyToWesley:" Even walking and sex won't bring on labor. The semen will ripen your cervix, the same as EPO. Ripening ... [snip!] ... Walking, while a great exercise, won't bring induce labor either. It's said to speed up labor once it's started, though!"
Pretty much EVERYTHING is to help labor keep going when it's already happening. Like orgasms, walking etc.
OP: You can bounce on a ball and walk and stuff, it might help you dilate if
your baby is already engaged. If you are dilated it's just less work you have to do when you are in labor. But all of that won't START labor, that's just something your body does on it's own when it's time.