Bodyweight fat-blaster

We Heart Living – workouts for women – bicycle crunch

Bicycle crunch – abs burner!
Instructions:
Lie on the floor with hands by your temples.
Crunch up and twist your body, bringing your left knee in to reach your right elbow. Keep the right leg extended just inches above the floor.
Twist your body the other way, bringing your right knee in to reach your left elbow, switching to extend the left leg – this is the next rep.
Repeat fluidly, keeping your upper back and legs off the floor for the full set.