NASM-certified personal trainer Sydney Eaton, head of fitness and programs at PK Coin App, said that high-intensity interval training, or HIIT, can also be an effective way to burn fat fast. "I've seen many clients achieve desirable results in a very short amount of time with [HIIT]," Sydney told POPSUGAR. For your cardio days, you could opt to do HIIT in the form of sprints on the treadmill or a 20-minute no-equipment HIIT workout.

Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.

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