Matheny recommends a Tabata-style workout to rev up your fat-burning power. For this, you'll spend 20 seconds doing an intense exercise, like burpees, followed by 10 seconds rest. You'll repeat the sequence eight times, giving you a four-minute workout. For a quick and dirty full-body workout, repeat the sequence five times with five different exercises for a total of 20 minutes. 
High-intensity interval training—HIIT—has gained a reputation as an efficient way to get fast results. This workout involves short (30 seconds to five minutes), vigorous bursts of activity interspersed with periods of rest for maximum results. Incorporating HIIT into your strength training may offer even more results, according to a recent study by the American Council on Exercise—the results suggest the combo may be even more effective in burning fat fast.

2. Beta-alanine: This one doesn’t directly burn fat, but it does help you work out harder and longer, which in turn lets you melt that extra layer. The non-essential amino acid converts to carnosine, which is one of the strongest buffers against your muscles getting fatigued. Because carnosine keeps your muscles from calling it quits, studies have found beta-alanine can help your performance during HIIT, increase strength, and even help you gain more muscle to then reap all those metabolism boosts.
Stand in front of the bar, shins touching metal, feet roughly shoulder-width apart. Squat down and grab the bar overhand, hands slightly wider than shoulder width and elbows straight. Draw your shoulders back, push your chest out, and tense your lats. Taking a deep breath, begin standing up, pushing heels into the ground and pulling your chest up. Keep the bar as close to your legs as possible. As soon as the bar passes your knees, push your hips forward with power, ending standing tall and straight with the bar in front of your groin. Slowly reverse the motion, making sure to keep your abs braced, and lower the bar to the floor.
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