Up-down planks (also called walking planks or commando planks) are an exercise I dread every time I come across them in a ...

The triceps are the first to give out during push-ups, and mine were trembling toward the end of the 70 reps each day. My ...

6. Plank up-downs 1. Start in a forearm plank with your elbows on the ground directly under your shoulders. 2. While keeping your hips stable, place your left hand under your left shoulder ...