On your elbow for a side plank with obliques engaged and hips up, exhale and reach top arm up then reach under body and repeat staying up the entire time or you can lower and raise after each rep for a variation.
On your elbow for a side plank with obliques engaged and hips up, exhale and reach top arm up then reach under body and repeat staying up the entire time or you can lower and raise after each rep for a variation.