And although plenty of researchers have recently trumpeted the value of fast, über-intense cardio (also known as high-intensity interval training, or HIIT), in practice, many fitness professionals have found that the system has drawbacks, particularly when practiced regularly over long periods. Though some trainers argue that steady-state cardiovascular training is inefficient, others counter that this traditional approach to cardio exercise delivers indispensable benefits you can’t get from pushing the envelope every time you work out. For her part, Susan has begun to miss her mellower workouts and questions whether slower cardio might be the ideal way to give her achy joints a chance to recover.īoth women are onto something. Lately, though, Jane’s been hearing about the benefits of high-intensity interval training and has started to wonder whether Susan’s approach may be just what she needs to kick her fitness up another notch. Jane and Susan are both in great shape: They look fit, and they’re lean and healthy. But like Jane, she never alters the structure of those sessions - it’s always sprint, rest, repeat. Sometimes, she, too, does her workouts indoors. Jane’s neighbor, Susan, is equally dedicated, but she gave up jogging last year in favor of something a trainer told her is more effective: Instead of trotting steadily, she sprints as hard as she can for 30 seconds, rests for a couple of minutes, and then repeats this sprint-rest cycle for 20 minutes. The routine is always the same: 30 to 60 continuous minutes at an even speed. If it’s cold or rainy, she heads to the gym and hops on the treadmill. Three times a week, she gets up early, slips on her running shoes, and ventures out into the cool air, running at a strong, steady pace.
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