I've actually seen some Spec Ops dudes (not sure which specialty, Ranger, Seal, etc.) in the base gym doing roughly what the OP posted. They hold 135 extended out at arms length while doing 100 flutter kicks. It may look weird, but I bet its hard as hell too and a heck of a core workout.
Boyd - I know you were pararescue - so you know there are tons of weird exercises that those dudes do......
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