Burn calories and enjoy the outdoors with this quick HIIT workout with — throwback! — inline skates.

Image Credit: Sarah Casillas/DigitalVision/GettyImages Remember the Rollerblades you stashed in your garage or closet in the ’90s ​just in case​ you ever wanted to use them again? Well, today is the day you dig them out.

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 The in-line skating you did way back when may have been more on the easygoing side of the fitness spectrum, but this blast-from-the-past workout is designed to burn maximum calories in minimal time — and it's a safe way to spend some time outside when you're stuck at home.

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  The 20-minute Rollerblading routine below takes the shape of a high-intensity interval training (HIIT) workout. Alternating between periods of hard work and short periods of rest is an extremely time-effective way to burn calories, according to a March 2014 study in ​Applied Physiology, Nutrition and Metabolism​. In fact, in just 20 minutes of Rollerblading, a 155-pound person can burn around 175 calories, according to Harvard Health Publishing.

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 Plus, you might find HIIT workouts more enjoyable than steady-state training like 30-minute jogs or walks. In a small July 2016 study in ​PLOS One​, for example, women rated HIIT cycling workouts as more fun than cycling continuously at the same speed. Bonus: You're more likely to stick with a fitness routine you actually enjoy.

The Warm-Up Before you lace up your blades, get your body ready for exercise with 3 rounds of the following:

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10 jumping jacks 10 forward folds (reach to the sky and then reach toward your toes) 10 arm circles forward 10 arm circles backward

​Check out more of our 20-minute workouts here — we’ve got something for everyone.​ The Workout This 20-minute HIIT Rollerblading workout is a classic Fartlek session. “Fartlek” is a Swedish term that means “speed play” — not a made-up word. Structuring your HIIT workouts this way can help you improve both your speed and endurance. You’ll work continuously for a set period of time — in this case, 20 minutes — with speed changes throughout.

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  ​Minute​

​Pace​ 0:00 - 2:00 Moderate 2:00 - 3:00 Fast 3:00 - 3:30 Sprint 3:30 - 6:30 Easy 6:30 - 8:30 Moderate 8:30 - 9:30 Fast 9:30 - 10:00 Sprint 10:00 - 12:00 Moderate 12:00 - 13:00 Fast 13:00 - 13:30 Sprint 13:30 - 16:30 Easy 16:30 - 18:30 Moderate 18:30 - 19:30 Fast 19:30 - 20:00 Sprint An ​easy pace​ means you should be able to talk freely while skating. Your heart rate should only feel slightly elevated, and you should be able to control your breathing. A ​moderate pace​ should make it difficult, but not impossible, to talk. You may only manage a couple words at a time, and your breathing will be heavier. A ​fast pace​ means you’re working hard, but you should still feel like you can keep going after the interval is up. You probably won’t be able to talk. You should be taking long strides on your skates and starting to feel a burn in your muscles.

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 A ​sprint pace​ is an all-out effort. You definitely won't be able to talk and your heart will be pounding. You may get significantly winded — but you can do this!

The Cooldown Once you complete the ‘blading circuit, slow it down with an additional five minutes of skating at an easy pace. You can also opt to take your Rollerblades off and walk instead. Then flow through a few of the best stretches for your legs to minimize the risk of post-workout soreness.

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  references
  
      Applied Physiology, Nutrition and Metabolism: "Is High-Intensity Interval Training a Time-Efficient Exercise Strategy to Improve Health and Fitness?"
    
      PLOS One: "Comparison of High-Intensity Interval Training and Moderate-to-Vigorous Continuous Training for Cardiometabolic Health and Exercise Enjoyment in Obese Young Women: A Randomized Controlled Trial"
    
      Harvard Health Publishing: "Calories burned in 30 minutes for people of three different weights"
       




  references
  
      Applied Physiology, Nutrition and Metabolism: "Is High-Intensity Interval Training a Time-Efficient Exercise Strategy to Improve Health and Fitness?"
    
      PLOS One: "Comparison of High-Intensity Interval Training and Moderate-to-Vigorous Continuous Training for Cardiometabolic Health and Exercise Enjoyment in Obese Young Women: A Randomized Controlled Trial"
    
      Harvard Health Publishing: "Calories burned in 30 minutes for people of three different weights"
    




Burn calories and enjoy the outdoors with this quick HIIT workout with — throwback! — inline skates.

Image Credit: Sarah Casillas/DigitalVision/GettyImages

Image Credit: Sarah Casillas/DigitalVision/GettyImages

​Check out more of our 20-minute workouts here — we’ve got something for everyone.​

​Minute​ ​Pace​ 0:00 - 2:00 Moderate 2:00 - 3:00 Fast 3:00 - 3:30 Sprint 3:30 - 6:30 Easy 6:30 - 8:30 Moderate 8:30 - 9:30 Fast 9:30 - 10:00 Sprint 10:00 - 12:00 Moderate 12:00 - 13:00 Fast 13:00 - 13:30 Sprint 13:30 - 16:30 Easy 16:30 - 18:30 Moderate 18:30 - 19:30 Fast 19:30 - 20:00 Sprint

      Applied Physiology, Nutrition and Metabolism: "Is High-Intensity Interval Training a Time-Efficient Exercise Strategy to Improve Health and Fitness?"
    
      PLOS One: "Comparison of High-Intensity Interval Training and Moderate-to-Vigorous Continuous Training for Cardiometabolic Health and Exercise Enjoyment in Obese Young Women: A Randomized Controlled Trial"
    
      Harvard Health Publishing: "Calories burned in 30 minutes for people of three different weights"