Skin the cat

Start by hanging from a bar with your arms fully extended and your body relaxed. Engage your core and lift your legs up, bringing your knees towards your chest. Continue to lift your legs up and over your head, allowing your body to pass through the arms. Once your legs are fully extended over your head, begin to lower them back down towards the starting position. As you lower your legs, allow your body to pass back through the arms until you are hanging with your arms fully extended again. Repeat for the desired number of repetitions.