Modified V-up

Start on your back with your legs straight and arms over your head. Engaging your abs, sit up as you bring your arms towards you ankles and simultaneously tuck the knees in towards your chest. Keep your back straight and shoulders back as you come up into a modified "V." Slowly lower yourself back to the ground into the start position. If this is challenging, you can do the same movement alternating with single leg. For the more advanced version, keep the legs entirely straight throughout the movement. Do 3 sets of 10-20 repetitions.