Q: I want to exercise for my health, but I have a busy schedule and only have 30 minutes to fit in a workout. How can I make the most of that time?

If you’re pressed for time, high-intensity interval training (HIIT) is the most efficient form of exercise. It’s the exercise intervention that improves health the most.

With HIIT, you cycle through rigorous exercise and rest: Go all out for 30 seconds to a minute, rest in between, and repeat 10 to 12 times. The goal is to push your heart rate through all five zones . When you push your heart rate to its maximum, it improves your VO2 max , which is a good indicator of cardiorespiratory fitness. Having a higher VO2 max is also associated with longevity and functional health as we get older.

If weight loss is a focus for you, HIIT traini

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