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High-Intensity Interval Training (HIIT): What Is It and Why Is It Effective?

, by FLOW Admin, 6 min reading time

If you're looking to maximise your workout results in less time, high-intensity interval training (HIIT) might be exactly what you need. HIIT has gained massive popularity in recent years, and for good reason—it’s known for delivering quick and effective fitness results. But what exactly is HIIT, and why is it so effective? Let’s break it down.

What Is HIIT?

HIIT is a workout strategy that alternates between short bursts of intense activity and brief periods of rest or low-intensity exercise. These intervals are repeated multiple times during the workout session. Typically, a HIIT workout lasts anywhere from 15 to 30 minutes, making it a great option for those with a busy schedule.

For example, you could do burpees, squat jumps, or running on the spot for 45 seconds and then rest for 30 seconds, repeating this cycle for 10-20 minutes. The goal is to push your body to work as hard as possible during the intense periods, followed by recovery during the rest intervals.

Why Is HIIT So Effective?

  1. Burns More Calories in Less Time

One of the major benefits of HIIT is that it allows you to burn a significant number of calories in a short amount of time. Because you're working at such a high intensity during the active intervals, your body burns more energy than it would during steady-state exercises like jogging. Research has shown that HIIT can burn up to 30% more calories than other forms of exercise in the same amount of time.

  1. Boosts Metabolism and Promotes Fat Loss

HIIT not only burns calories during the workout but also increases your metabolism for hours afterward. This phenomenon is called Excess Post-Exercise Oxygen Consumption (EPOC), often referred to as the “afterburn” effect. Essentially, your body continues to burn calories even after the workout is over as it works to recover from the intense effort. This makes HIIT particularly effective for fat loss, as it helps reduce body fat while preserving muscle mass.

  1. Improves Cardiovascular Health

The short bursts of intense activity during HIIT workouts push your cardiovascular system to adapt, improving heart health and endurance over time. Studies have shown that HIIT can help reduce blood pressure, lower heart rate, and improve oxygen consumption, making it a great option for those looking to boost their cardiovascular fitness.

  1. Requires No Equipment

One of the best things about HIIT is its flexibility. You don’t need any special equipment to get started—all you need is your body! Exercises like burpees, jumping jacks, squats, and sprints are all perfect for HIIT workouts. Whether you're at home, in the park, or traveling, you can squeeze in a quick HIIT session without needing a gym or weights.

  1. Can Be Adapted for All Fitness Levels

While HIIT is known for being intense, it’s also highly adaptable. Whether you're a beginner or a seasoned athlete, you can tailor the intensity of the intervals to match your current fitness level. Start with shorter intervals of high intensity and longer rest periods, and as you build endurance, you can increase the intensity and shorten your rest.

Additionally, you can modify certain exercises to lower-impact options without sacrificing the benefits. For example, if high-impact moves like burpees or jump squats feel too challenging or put too much strain on your joints, you can swap them for lower-impact alternatives. Instead of a burpee, you can try stepping back one foot at a time into a plank position, then standing up without the jump. This reduces the stress on your knees while still engaging your core and upper body.

How to Get Started with HIIT

If you’re new to HIIT, start slow and gradually increase the intensity as your fitness improves. Begin with a 1:2 ratio of work to rest—30 seconds of high-intensity exercise followed by 60 seconds of rest or low-intensity activity. As you progress, you can move toward a 1:1 ratio or even shorter rest periods to challenge yourself.

Here’s a simple beginner HIIT workout you can try:

  1. Warm-up: 5 minutes of light jogging or dynamic stretching.
  2. Workout:
    • 30 seconds of jumping jacks
    • 60 seconds of rest
    • 30 seconds of bodyweight squats
    • 60 seconds of rest
    • 30 seconds of burpees
    • 60 seconds of rest
    • 30 seconds of backwards lunges
    • 60 seconds of rest
    • 30 seconds of high knees
    • 60 seconds of rest
      Repeat for 3-5 rounds or go until you’ve reached 15-20 minutes.
  3. Cool-down: 5 minutes of light stretching or walking.

Additionally, there are plenty of free HIIT workout videos available online, making it easy to find something suited to your fitness level. Joe Wicks, known as "The Body Coach," has a wide variety of HIIT workouts on YouTube, ranging from beginner to advanced levels. His sessions are perfect if you're looking for guided instruction and motivation. You can check out his HIIT workouts on his YouTube channel here.

FAQs

Can I combine HIIT with other forms of exercise?

Yes, you can definitely combine HIIT with other types of exercise. In fact, pairing HIIT with strength training, yoga, or steady-state cardio can create a well-rounded fitness routine. If your goal is to improve overall fitness, you might want to alternate HIIT sessions with lower-intensity workouts or strength training to balance cardiovascular health with muscle development. For instance, you could do HIIT workouts twice a week while incorporating strength training or lighter cardio on the other days. This approach helps prevent burnout and ensures that different muscle groups are being targeted effectively.

Can HIIT help build muscle, or is it just for fat loss?

While HIIT is widely known for its fat-burning benefits, it can also help with muscle maintenance and, in some cases, muscle building, especially when combined with bodyweight or resistance-based exercises. Movements like burpees, squats, and push-ups in HIIT workouts engage multiple muscle groups, helping to strengthen and tone your body. However, if your primary goal is muscle growth, you'll likely need to incorporate more focused strength training into your routine, as HIIT alone may not provide the necessary volume for significant muscle hypertrophy.

Is HIIT suitable for older adults or people with joint issues?

HIIT can be suitable for older adults or individuals with joint issues, but modifications may be necessary to make the workouts safe and effective. Low-impact exercises, such as stepping in place instead of jumping jacks or performing squats without deep bends, can reduce strain on the joints while still offering the benefits of high-intensity training. It’s important to focus on controlled movements and listen to your body, stopping or adjusting as needed.


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