Top Marine approves planks as an alternative to crunches

Does a better job on your abs and is safer for your back. Lots of ways to vary them too. I do a lot of these.

TSgt Joe C. PO3 Steven Sherrill CW3 Kevin Storm SSG (Join to see) SGM Steve Wettstein SMSgt Thor Merich MSG (Join to see) PO1 John Johnson MAJ Ken Landgren LTC Greg Henning PVT Mark Zehner MSG Tom Earley Alan K. SPC Mark Huddleston PO1 H Gene Lawrence SGT Elizabeth Scheck Sgt Deborah Cornatzer SSgt Boyd Herrst SPC Diana D. SFC George Smith

That is interesting....