The v-sit w/ bicycle legs is a fabulous combination move strengthening both the abs and the quadriceps simultaneously.
Begin sitting up with good posture with your hands at your sides and just behind your hips.
Then lean back leading with the shoulders until your ab contraction becomes challenging.
Now bring your legs up and around as if you were riding a bike. Make sure you’re going in a complete circle and not just back and forth. Now try bicycling backwards. Then alternate your bicycle with one rotation forwards, and one rotation backwards.
The v-sit strengthens the abs, the bicycle legs strengthen the quadriceps, together you have a great combination strengthening and fat burning move.