It combines strength and cardio into one total body sweat session.
Warmup: 10 to 15 minutes of easy running. Add some light dynamic drills to loosen up and wake up your muscles before harder efforts begin. Set 1: 12 minutes of tempo effort–comfortably hard, but ...
2don MSN
If you’re not training your core like this, you might be missing out on serious strength gains
Psst: it's not another plank.
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