"The plank itself isn't going to show results for multiple reasons, and one key one is this: It's challenging your body (and more precisely, your core musculature) through just one brand of contraction: isometric. You're holding a fixed position," says Men's Health's Ebenezer Samuel C.S.C.S.
"It's generally hard to build muscle and burn calories with the use of isometrics alone," he continues. "Additionally, it's challenging just one responsibility of your core: Bracing. This is important, but it's not challenging anti-extension, anti-rotation, rotation, or spinal flexion, all other responsibilities of your core. So the plank winds up being a very, very limited move if used in a vacuum."
One way to work more of your core muscles is the side plank, which targets the obliques (an important and oft-overlooked muscle group).
"The starting point for all oblique exercises should be the side plank," says trainer Charlee Atkins C.S.C.S. "And if you can't hold a side plank on your feet, shorten the lever and take it to your knees. Why is this important? Our cores should limit the amount of motion we allow for the torso to bend sideways."
Alternatively, to up the ante in your core workout, you can try plank progressions, which burn your abs by bringing additional levels of difficulty to the basic move.
This article originally appeared on Men's Health