Planks are so, so good for you. But they’re also kind of, well, boring. Holding a plank for 30 to 60 seconds means you’ve got nothing but the floor to distract you from that deep burn quaking up through your bod. The burn is a good thing; the boredom is not. Once you’ve nailed the proper plank form (here’s how to do it), it’s time to have some fun. Try adding these different planks to your workout to keep crushing your core.