Amazing All ‘Round core exercises that will help strengthen your abs, lower back, and obliques. This exercise is done in a semi-circle fashion while bringing opposite knees to opposite elbows. To start this movement, position the suspension trainer handles 12 inches off the ground and set yourself up in a feet elevated push-up position. Next, brace your core focus on keeping your back flat and bring your right knee to your left elbow. Once you get to your elbow, in a controlled manner, swing your knee back to the starting position. Next, repeat the same motion but with your left knee going to your right elbow, then back to the start position. Hitting each elbow once is one full rep of this exercise.