Sprint off your weight
CARDIO IS THE cornerstone of any good weight-loss plan—, especially intervals, in which you alternate going as fast as possible with brief periods of recovery. To help you make those sprints as effective as possible, we asked Phil Campbell, an interval-training expert and author of Ready, Set, Go! Fitness for his best fat-burning tips.
- "You want to take your heart rate up progressively," Campbell says. "Focus on large muscles like the hamstrings and quads. Try ankle circles, knee circles, some light hip stretches—they all get your muscles and ligaments prepared to fire faster."
Time your sprints
- "The key is to get totally winded in 30 seconds or less," he says. "If you're on a treadmill [or an exercise bike], start sprinting as the machine speeds up. When it reaches top speed, go all out for 30 seconds. Then slow it down and go nice and easy for 90 seconds to recover." If you're running outside, try to cover about 200'—roughly half a city block—as fast as possible. Walk slowly for 90 seconds to cool down, then repeat your course.
- Almost everyone leans forward when they work out on a cardio machine. This lets you use gravity to pull you forward, making the effort a bit easier. "If you stay upright during your sprints," Campbell says, "it keeps the intensity on your muscle the entire time."
Never rush recovery
- You get the biggest spike in calories burned when your body is forced to transition from a state of rest to a state of full-on activity, Campbell says. "Even if you feel like you can go all out again after just 30 seconds, you're still better off waiting the extra minute and then pushing yourself even harder."
Go gradually outdoors
- "When running outside, start with 50% of your top speed on your first interval. Go up to 60% or 70% on the next and so on." Push your body as hard as you can as you get into the groove of the workout, says Campbell.
- "You should never feel duty-bound to do two intervals today, three the next time you work out, and four the time after that. The overall intensity of the intervals you complete is more important than how many you do in any given workout."
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