Originally Posted by
ridethecliche
If you really want to hurt, do planks and hold your left arm and right leg (and vice versa) in the air.
Can you do these? Planks from elbows or hands? I tried them in today's workout from elbows...not a chance! I had to shift too much to stabilize. Guess that's a much more advanced than my ability at this time.
I'll have to try molecularman's recommendations next time.