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Anonymous
Do bridges.
Side bridges, front bridges, and back bridges.
for side and front, prop yourself with an elbow (both for front) and hold your body rigid between your arms and feet. The same can be done for the back by elevating either the shoulders or feet then holding yourself rigid by flexing the back. Hold the positions for as long as possible.
I don't know if these will get you as much as crunches normally could, but it's better than nothing.
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