Mark Ottobre shows why narrow hand placement and sagging hips wreck your plank. Keep hands at shoulder width, squeeze your upper body, tuck your pelvis, and hold a straight line from shoulders to heels.
Most people who do a plank, they go super narrow and they do this, right? You can see how like this does absolutely fuck all. What you want to do when you do a plank is go nice and fairly wide, either inside of shoulder width or just outside for more of a challenge. Squeeze, so all of your upper body. Then here, let's say hide your boobs. Like, you don't want to be here, you want to be here. Then the next thing, you don't want your bum to be here. See how I pull in? See, my pelvis is in now, flexing everything.
