Once you finished your dips, lower your hips back to the floor, bend your knees in close to your chest, lifting both feet off the ground and balancing on your sit bones. Bring both hands together and clasped behind your head, elbows bent out to the sides. Draw your abs in tight and lean back and touch your lower back on the ground, while extending both legs out, as straight as you can, away from your body (your shoulders should remain off the floor in this extended position). Squeeze your abs in tighter, and then sit back up to your starting position, using your abdominals, not momentum, to sit all the way up. That's one rep. Do 10 reps in total and then repeat your dips [2A].
Form tip: If this is too tough to do with your hands behind your head, you can try reaching your arms out towards your feet, or even placing your hands on the floor lightly behind your hips.
Try to complete 2 full sets, moving quickly back and forth between the dips and the sit ups, before moving on to the next set.