We’ve all seen those viral fitness clips—ab roller on a barbell, fingertip push-ups, balance tricks that look way too easy. But are they really first try? In this video, I take on the world’s hardest ...

Sit flat on the floor with your legs open and outstretched and a pair of dumbbells on your shoulders. Take a breath and brace your core. Keeping your torso upright, press the dumbbells overhead. Lower ...