A plank is a core exercise that requires glute and leg strength, as well as shoulder stability. To hold a plank, you need to keep your spine neutral and support it with your abdominal muscles. That ...

We may earn a commission from links on this page. Credit: Ian Moore / Lifehacker Composite; Oscar Wong / Moment / dimarik / iStock / Getty Moving is almost always stressful, and anything but fun—but ...