You know what I did? Look up Evening Primrose Oil pills. I put 4 against my cervix (up the vag) the night of July 3rd. On July 4th, I woke up cramping but I got up in the AM and walked about an hour. By 6pm on July 4th, I was in labor and 5cm dilated. Evening Primrose Oil pills are super safe and they DEFINITELY put me into labor. They only put you into labor if you're body is ready. If you AREN'T ready, they have no effect.
Well your feet will be on the floor so make sure you're balanced before you start but if you're worried you could put the ball next to something to keep your hand on to keep you steady. Just make sure you bounce hard not soft.
what if I fall even I the carpet I can hurt myself .
Bouncing on a ball helped me.