Knee Tucks
Rowers aren’t reserved for cardio — though this will get your heart pumping. Hold a solid plank as you use your lower abs to drive both knees into your chest, without dropping or raising your hips.

Rowers aren’t reserved for cardio — though this will get your heart pumping. Hold a solid plank as you use your lower abs to drive both knees into your chest, without dropping or raising your hips.
Side Plank with Leg Raise

Foam rollers not only loosen up your fascia, but they also add a stabilization challenge to ab exercises. In this side plank variation, you’ll feel your midsection fighting to keep your body steady.

A chaturanga-inspired exercise often done on a reformer; you’ll take this move to the mat. Your obliques work to bring you upright, as the rest of your core stays tight to move you through the middle.

Photo courtesy of CorePower Yoga
A slight twist on a high-low plank move, you’ll flow from a yoga sphinx pose (similar to a baby cobra) into a forearm plank. Try to minimize movement in your hips as you go.

A regular plank is tough in itself. But balancing on one arm? Talk about taking this core challenge up a notch.

Take your abs workout to P.E. class and army crawl your way across the mat. Stay low in a strong forearm plank as you slither your arms and legs forward. Then finish with a side plank to target your obliques.
When it comes to improving core stability, the plank has your back (and your front!). By working your transverse abdominis — the deep core muscles that wrap around your middle — as well as your back, shoulders, and glutes (yes, you should activate your butt, too), you get a full body burn in one isometric movement. But the best thing about planks: You can continuously switch them up and make your muscles work even more. Check out these creative twists on a typical plank routine and you’ll see what we mean.

Get total body toned with this amped up plank. While performing a triceps push-up, bring your knee to the outside of your elbow, and switch sides on the next rep. Don’t drop or pike your hips through the entire move — your body should stay in a straight line from shoulders to ankles.