Fitness coach Mark Ottobre corrects plank form by hiding your tailbone, drawing your belly button toward your spine, and keeping your neck neutral. He uses the cue "imagine $1,000 in your bum cheeks" to force glute activation and stresses that your entire trunk must feel stiff and resist pressure.
Crazy, I've never done a plank like that before. So here I want your pelvis to hide your tailbone, right? And you're going to draw your belly button up, neck neutral. So head up a little bit for me. Squeeze your bum as hard as you can, right? Imagine there's $1,000 in your bum cheeks. I'm trying to pull it out, you're trying to keep it in just with your bum cheeks. See how I can push you? Don't let me push you, right? Everything should be stiff. This, your trunk. So if I'm putting weight on you, this should be stiff. This is not a passive ex— this is good. Now where'd you feel it? On the upper abs. Yeah, you're red now, which is good. The blood went to my head.
