Lt. Cmdr. Chris Bonner let us into his home gym in Virginia to shoot Bob Thomas' next Military Muscle workout.

Bonner, a Coast Guard aviator who has been coaching CrossFit since 2008, is also a Military Muscle alum. His first appearance in OFFduty was for this brutal workout from Bob.

This time we were a little easier on Chris, only asking him to tackle Bob's crunch-less -- but still tough -- core workout.

He of course crushed it.

Get this workout in the July 8 issue of OFFduty, on newsstands July 1.

Do you want to be in an upcoming issue? Here's how.

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