The simple plank exercise is a staple of most of the best ab workouts, but what would happen if you held a rock-solid plank every single day for a week? As a fitness editor, I set out to find out more.
Luckily for me, you don’t need to hold a plank for as long as you think to get results — one researcher suggests you only need to hold the move for 10 seconds to work your core. A plank is an isometric exercise, designed to strengthen during the stillness, as your body works against gravity to hold the pose.
