When it comes to exercise, long and slow or hot and fast? For those with busy schedules, what’s the best and most effective way to get fit?

The Boston Globe reports:

If your dream is to run a marathon or if you simply prefer more meditative activity, there’s no substitute for a jog. But if you’re looking to lose weight faster and like things lightning fast, you might be better served by all-out intervals that require quick energy.

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