CrossFit might seem like it’s for alpha dog triathletes and gym sadists, but it’s actually built on a training philosophy that’s directly applicable to guys with limited time: intervals. Doing bodyweight or kettlebell exercises for intense bursts with short breaks in between are proven to be more efficient at burning calories, toning muscle and improving cardio fitness than standard weightlifting or cardio workouts, and a little goes a long way. Here’s one program from CrossFit pioneer Kelly Starrett, which can be done in just three 10-minute sessions each day. He’s got 2 kids of his own so, … yeah. What’s your excuse?
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