Start seated with your knees bent into your chest, feet lifted, balancing on your glutes. Bend both elbows by your sides, with your hands in fists.
Extend your right leg out straight and hover it above the floor as you lean back, reaching your right arm towards your right foot.
Quickly switch legs, leaning back every time your legs extend. Repeat as quickly as you can, alternating legs each time, for 20 reps. (Keep your abs braced in tight to your spine to maximize your abs work during this one).
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Torch fat and sculpt your abs with these 5 multitasking moves
Express Workout: 10-Minute Cardio Blast
10-Minute Workout: Calorie-Blasting Cardio