Owen PalmerBy Owen Palmer

Updated November 2026

High intensity interval training, or HIIT, alternates short bursts of hard effort with timed recovery periods. This guide shows you how to set your effort level, choose work-to-rest ratios, and build a session you can repeat safely. By the end, you will have a simple workout you can run on a track, treadmill, bike, or in a park.

Step 1: Set Your Effort Level

High intensity means hard, not maximal every second. For the work intervals, aim for an effort you could sustain for only about 30 to 60 seconds. On a 1 to 10 scale, that usually lands around an 8 or 9. You should be breathing hard enough that holding a conversation is difficult, but you can still keep good form.

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Beginners often start too hard and fade by the third round. Pick a pace you can repeat with only a small drop-off in speed from the first interval to the last.

Step 2: Choose a Work-to-Rest Ratio

The ratio of work to recovery controls how hard each session feels. Common starting points look like this:

Format Work Recovery Best for
Beginner 20 seconds 40 seconds First 2 to 4 weeks
Standard 30 seconds 30 seconds Most runners and cyclists
Advanced 60 seconds 60 seconds Trained athletes

Recovery should be easy movement, such as walking or slow pedaling, not full rest. This keeps your heart rate elevated and helps you hold effort across rounds.

Step 3: Build a Session Structure

A complete session has three parts: a warm-up, the interval block, and a cool-down. Most beginners do well with the following plan:

  1. Warm up for 8 to 10 minutes at an easy, conversational pace.
  2. Complete 6 to 8 rounds of your chosen work and recovery intervals.
  3. Cool down for 5 minutes at a gradually slower pace, then stretch lightly.

Total time is usually 20 to 25 minutes. Longer is not better here, because quality drops quickly once the intervals lose their intensity.

Step 4: Progress Gradually Across Weeks

Add Rounds Before Adding Intensity

In week one, do four rounds. Add one round each week until you reach eight. Once eight rounds feel controlled, shorten the recovery or lengthen the work interval.

Limit Sessions Per Week

Two sessions per week is enough for most people starting out. Leave at least one day of easy activity between them so your legs and joints can recover. Consult a doctor before starting if you have a heart condition, high blood pressure, or joint problems.

Tools You May Need

  • A timer or interval app with audible countdowns
  • Running shoes or cross-training shoes with stable soles
  • A heart rate monitor, if you want an objective effort check

Common Mistakes

  • Starting with too many rounds. Begin with four and build up.
  • Recovering too fully, which makes the session feel easy and lowers the training stimulus.
  • Skipping the warm-up. Cold muscles raise the risk of strains during fast efforts.
  • Doing HIIT every day. Recovery is part of the training.
  • Ignoring pain. Sharp or joint pain is a reason to stop and rest.
  • Interval timer app or wrist timer: Automatic countdowns let you focus on effort rather than the clock. View on Amazon
  • Supportive running shoes: Good cushioning and a stable heel help absorb the impact of fast running intervals. View on Amazon

FAQ

How long should high intensity interval training last?

Most sessions run 20 to 25 minutes including warm-up and cool-down. The hard work itself often totals only 10 to 15 minutes.

How many times a week should I do HIIT?

Beginners should start with two sessions per week, with easy days in between. More experienced athletes may handle three, depending on their overall training load.

Can I do high intensity interval training if I am a complete beginner?

Yes, if you start with lower intensity and a 1:2 work-to-rest ratio. If you have medical concerns, speak with a healthcare professional first.

Conclusion

High intensity interval training works best when you match effort to your current fitness, use recovery periods that keep you moving, and build rounds gradually. Start with two sessions a week and track how each round feels. Once the structure feels comfortable, you can experiment with longer intervals or new formats.

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Owen Palmer

About Owen Palmer

Owen Palmer is part of our editorial team and reviews and edits our speed & interval running guides, checking product details against manufacturer specifications and owner feedback.