How To Tell If You’ve Reached The Optimal Heart Rate During A Workout

HIIT training describes a type of exercise that alternates between short bursts of intense training with short recovery periods. According to McCullough, these workouts should only take 7 to 25 minutes, including the warm up. “That 7 to 25 minutes, a couple days a week, does a lot of good,” he says. 

Like all things, it depends on your body type and physical fitness level. If walking every day feels better on the body than squat jumps, that’s perfectly OK. But, “assuming your joints are fine, your back is not hurting, your knees aren’t hurting, you can’t beat the efficiency of HIIT training,” he says.