The 30 Day Plank Challenge

A reader recently drew my attention to the 30 day plank challenge, which you can read about here:
http://fitnessgoals.com/30-day-plank-challenge-exercise-workout/

What I like about this exercise is that it strengthens several important muscle groups, but it doesn't cause wear to the joints because there is no motion involved.  My guess is the forearm pose would be much better since it puts no strain on the wrist, so try that if you have any issues with Carpal Tunnel Syndrome.

What other exercises do you like?  Let me know!