Adding interval training — bursts of high-intensity moves — to your workout is a great metabolism booster. "Studies have shown that people who do interval training twice a week [in addition to cardio] lose twice as much weight as those who do just a regular cardio workout," says obesity specialist Aronne. You can easily incorporate interval training into your workout by inserting a 30-second sprint into your jog every five minutes or by adding a one-minute incline walk to your treadmill workout. "Since your body is working harder, it's a more intense workout -- and you therefore burn more calories," says Westcott. On other days, shake up your routine with 40 minutes of cross-training. Ideally, aim for two 20-to-40-minute interval-training sessions and two 20-to-40-minute cross-training sessions a week.
“Most 40-year-olds can remember the fat-free craze of the ’90s, when Snackwells was king,” says Shapiro. “Well, those days are over.” She advises that you leave the fat-free fake foods behind and enjoy healthy fats that add flavor to your meals and help you fill up with less. “Coconut oil, avocado, nuts, seeds, salmon are rich in vitamins and minerals that will keep you young and fill you up on smaller portions, and therefore fewer calories.” She says.

building muscle over 40

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