Not only did it require nothing more than just my bodyweight, but it only took me 25 minutes and worked my entire body from ...

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But to get the benefits of HIIT, you need to be ready to work hard. A true HIIT session involves short bursts of intense ...

How to execute: Stand on the balls of your feet, raise your heels, then lower slowly. • Resistance bands ($1,500-$3,000) – ...