Lay on your back. Create a wrap with your legs, crossing your right knee over your left. If you have the flexibility to wrap your toes around your leg as well do it! Then create a wrap with your arms, placing left arm under right arm and clasp your hands.
Keep your spine in neutral and don't allow your lower back to arch off of floor. Exhale, scoop the belly out and bring knees and elbows together at center of body, inhale knees and elbows move away from each other, again not allowing the lower back to arch.
By having your arms and legs in this position it creates additional resistance for the crunch.
Complete 25 reps, switch wrap and complete another 25.