Elbow-to-knee

Start by lying flat on your back with your knees bent and feet flat on the ground. Place your hands behind your head with your elbows pointing outwards. Engage your abs and lift your upper body off the ground, bringing your right elbow towards your left knee. At the same time, bring your left knee towards your right elbow, creating a twisting motion. Pause for a moment at the top, then slowly lower your upper body and extend your legs back to the starting position. Repeat the movement, this time bringing your left elbow towards your right knee and your right knee towards your left elbow. Continue alternating sides for the desired number of repetitions.