with the push ups I will do elevated push ups; legs on a bench, on a chair, or leg lifted.
With Ball crunches/lateral flexion-swiss side crunch/hip I did weights with arms extended leaning far back or over (very hard)
I really didn't care for jackknifes but I did them
=-)I tried to go extra slow. I tried weight but that hurt my back. They are only in 2 stages. (I think)
Reverse crunch I did on an angled bench.
I hope that helps.
Sorry about the misunderstanding =-)
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