Getting your workout in first thing can burn more fat than sweating it out later in the day. When you first wake up, carbohydrates, your body’s preferred energy choice, are in short supply, so your muscles are forced to burn fat for fuel, a process known as ketosis. For men, they’re an added boost because testosterone levels are highest in the a.m., allowing guys to push a little harder during their workouts. Here’s how many minutes you need to exercise to burn fat all day long.
Any combination of drastically reducing calories and adding aerobic exercise will most certainly result in weight loss. The problem with this is that not all of the weight lost will be from fat. Some of it will be water weight, which is temporary, and some will be muscle. If you lose muscle along with fat, you’ll simply be a smaller version of your previous flabby self.
For this lightning-fast Tabata workout, pick four total-body moves (plank jacks, jump squats, etc.). Do one for 20 seconds, rest for 10 seconds, then do it again. Continue to the next move and repeat. The routine is just four minutes long—and you’ll torch 13½ calories a minute and double your calorie burn for half an hour afterward, per research from Auburn University in Alabama.
The prevailing formula for a long time on how much fat you’re going to burn was calories in minus calories out, based on your basal metabolic rate (BMR) and exercise efforts, explains strength and performance specialist Joel Seedman, Ph.D., owner of Advanced Human Performance in Atlanta. But with all the different biochemical reactions in the body, hormonal response, and endocrine function, there are an infinite number of factors that can affect how your body is storing and breaking down calories.