Awesome news: Turns out marathoning for an hour on the treadmill isn't only boring as hell, but it doesn't even give you that great of a workout. Experts say if you're trying to flatten your abs, one of the most effective methods is actually interval training, which means incorporating short bursts of high-intensity burnouts into whatever you're doing, whether that's running, squats, whatever. And bonus — it'll keep you burning calories for up to 16 hours post-exercise. Um, we'll take it.
“For some people, it’s knowing, ‘Typically I eat a whole sandwich,’” says Gagliardi. “‘Now, I’m going to make the decision to eat half a sandwich at lunch and save the other half for my dinner and essentially cut my calories in half. And they feel good about that. They’re not having to do math.” To get started, check out these 25 simple ways to cut 500 calories a day.
If you want to build muscle and burn fat at the same time, you have to perform circuit training three days per week. How can you achieve this? Indulge in full body exercises like lunges, push-ups, and pull-ups, for one set of 15 repetitions. Don't forget to follow every exercise with one minute of jumping rope. You should be able to burn around 500 to 600 calories per workout. 
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