You're going to feel your heart racing and blood pumping after just 45 seconds of this HIIT-favourite exercise. Mountain climbers work your entire body and burn lots of calories in the process.
- Start on your hands and toes with your body in a straight line from shoulders to hips.
- Bring your right knee in towards your chest, and as you return your foot to the ground immediately bring your left knee in towards your chest.
- Repeat at a quick pace, alternating legs for 30-45 seconds.
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