"There are so many things I love about this power-packed exercise," Sydney Eaton, NASM-certified personal trainer and head of fitness at PK Coin App, said. "First, it is a plank-based exercise, meaning it's going to get the entire core fired up. What I love about this particular variation is that as you crunch your knee in toward your chest, it mimics that crunching motion you would do in a regular crunch. The variation of bringing your knee to the opposite elbow, then outward toward the closest elbow, really targets the obliques from a variety of angles."
- Start in a traditional plank — shoulders over hands and weight on your toes.
- With your core engaged, twist to bring your right knee forward under to your left elbow, then bring that same knee to your right elbow to work your obliques and come back to plank.
- Repeat this with your left knee for one rep.
- Sydney suggests doing three sets of 10 on each leg.
