# HIIT Recovery Timer | Free Tool | 321 STRONG

> Time your HIIT intervals with science-backed recovery periods. Get smart work:rest ratios based on exercise type, intensity, and heart rate zone.

**URL:** https://321strong.com/tools/hiit-recovery-timer

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⏰   Timers Free  
# HIIT Recovery Timer
 Time your HIIT intervals with smart recovery periods based on heart rate and exercise type.

               
Tools like this one are built by the team behind 321 STRONG — trusted by 50,000+ foam roller users on Amazon.

 [Shop 321 STRONG on Amazon →](https://www.amazon.com/stores/321STRONG/page/032D49F7-CEC1-4EDB-B1E4-684E7AB0001C?maas=maas_adg_F4D5512AD692C30138B6764655B5DC4E_afap_abs&ref_=aa_maas&tag=maas&321src=tool-detail-cta)       High-intensity intervals only work if the rest periods are as deliberate as the work periods. Cut the rest short and the later rounds degrade into moderate cardio at high perceived effort; stretch it too long and the session loses the stimulus that made it worth doing. This timer lets you set work from 10 to 60 seconds, rest from 10 to 120 seconds, and anything from 1 to 20 rounds, then shows you the total session length before you start so you can see what you have actually built. It runs with audio cues at each transition, so you are not watching a screen mid-effort. Common ratios are a useful starting point rather than a rule: 1:1 for conditioning work, 1:2 or longer when the goal is repeated maximal output and each round needs to be genuinely hard. Whichever you pick, the session ends with the same advice — allow 24 to 48 hours before the next hard interval session, and foam roll within about 30 minutes while the tissue is still warm.

     
## How This Tool Works
 
321 STRONG has sold over 2 million foam rollers and spent 10+ years studying how people actually recover from training. The tools we build draw on that experience — combined with peer-reviewed research on myofascial release, recovery timing, and muscle physiology — to give you recommendations that are grounded in real evidence.

   🔬  Research-backed

 Inputs and outputs grounded in published sports science and recovery research.

    🎯  Personalized output

 No generic advice. Results adjust to your body, goals, and training history.

    ✅  Free, no signup

 All 321 STRONG tools are free to use. No account required, no email needed.

      
## Related Guides
[DOMS Explained: What Causes It and How to Recover FasterWhat follows a hard interval session.](/blog/doms-explained-what-causes-it-and-how-to-recover-faster)[Foam Rolling Before or After Workout: What Works BestThe 30-minute post-session window.](/blog/foam-rolling-before-or-after-workout-what-works-best)[Foam Rolling for Athletes: The Recovery Protocol That Actually WorksRecovery between hard sessions.](/blog/foam-rolling-for-athletes-the-recovery-protocol-that-actually-works)[Foam Rolling Calves: How to Actually Do It RightThe area intervals load hardest.](/blog/foam-rolling-calves-how-to-actually-do-it-right)[Why Your Muscles Feel Sore After Foam RollingNormal tenderness versus a problem.](/blog/why-your-muscles-feel-sore-after-foam-rolling)   
## Frequently Asked Questions
   
### What is a good work-to-rest ratio for HIIT?
 It depends on what you want from the session. A 1:1 ratio, such as 30 seconds on and 30 off, keeps heart rate elevated and trains conditioning. A 1:2 or longer ratio lets each round be genuinely maximal, which is the right choice when output per round matters more than total time under load. This timer supports both because they are different sessions, not better and worse versions of one.

  
### How many HIIT sessions per week is too many?
 Two to three hard sessions a week is where most people should sit, with at least a day between them. HIIT generates real training stress and the recovery cost is easy to underestimate because the sessions are short. If you want to train more often, make the extra days genuinely easy rather than moderately hard.

  
### Should I foam roll after HIIT?
 Yes, and sooner is better. Rolling within about 30 minutes, while tissue is still warm, is more comfortable and easier to do properly than waiting until the next morning when everything has stiffened. Sixty to ninety seconds per muscle group on whatever you worked is enough.

  
### How long should I rest between HIIT workouts?
 Twenty-four to forty-eight hours before the next hard interval session. The wide range reflects real differences in training history and session severity. Use the Recovery Time Calculator on this site if you want a number specific to what you actually did rather than the general guidance.

  
### Can I use this timer for Tabata?
 Yes. Tabata is 20 seconds of work, 10 seconds of rest, for 8 rounds — set those three values and the timer runs it, showing the four-minute total before you start. Worth knowing: the original protocol was genuinely all-out on every round, which is far harder than most sessions labelled Tabata.

       
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