I like to use the end of a heavy bag I keep on the floor for ground work. I also occasionally use a cinder block. However, the more stable the platform is, the easier the exercise becomes and you lose the balance developing benefit of using the medicine ball.
I like to use the cinder block if I'm alternating from side to side:
1) Get in standard push up position on cinderblock or heavybag.
2) Reach out with your right hand; with right hand on ground, explosively perform push up.
3) As you perform the push up, instead of pushing straight up, push up and to your left.
4) As you go over the cinderblock, replace left hand on cinderblock with right hand while reaching out with left to the ground.
5) Repeat as needed.
I try to move as quickly from one side to the other as I can.
As for the rest of the routine...Holy Cow!!!
