4. Round-the-world guard sit-ups 

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We use this one in taekwondo for ground self-defence, but it’s an awesome ab/cardio workout too – who knew! Make sure you keep your belly button stapled to your spine to engage the core. And no cheating! That means hands kept firm in guard position rather than using them for momentum. 

» Lie on your back with your guard up and raise your knees up to your chest.

» Lift your hips and lead with your butt to pivot your hips to one side.

» Continue to lift your hips, pivot your butt to the side and crunch the abs in a circular motion so that you wind around. And don’t forget to breathe (exhale as you crunch)!

» Complete one 360-degree round of these, then onto anticlockwise.