Do this quick plank circuit as few or as many times as you want–all you need is a little floor-space and yourself for this do-anywhere core-strengthener.
Raise your hand if you’ve ever held a plank while scrolling through Instagram on your phone.
If you could see me now, I’d be raising my hand. Although now that I think about it, it was Pinterest, not Instagram. In my defense, you can keep fairly good forearm plank form while scrolling, but I wouldn’t recommend it because I’m working on the difficult art of not-multitasking.