# HIIT Recovery Timer | Free Tool | 321 STRONG > Free HIIT interval timer. Set work, rest and rounds, see the total session time before you start, and hear spoken cues and beeps at every work and rest change. **URL:** https://321strong.com/tools/hiit-recovery-timer --- Timers Free # HIIT Recovery Timer Time your HIIT intervals: set work, rest and rounds, see the total session time, and hear a spoken cue and a beep at every change. Free tools from the team behind 321 STRONG foam rollers. [Shop 321 STRONG on Amazon →](https://www.amazon.com/stores/321STRONG/page/681FF881-CA4D-4103-A748-B15E4F900A6B?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. A recorded voice calls the round count at the start, Work and Rest at every change with the next round named during the rest, and Three, Two, One over the last seconds of every interval, and a beep marks each change too, so you are not watching a screen mid-effort. The voice can be switched off, and the setting is remembered in your browser. 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 add a few minutes of easy rolling to your cool-down. ## How This Tool Works 321 STRONG has spent 10+ years making foam rollers and 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 BestWhere rolling fits around a hard session.](/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 the right number for the majority of people, 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, as part of your cool-down or later the same day. Sixty to ninety seconds per muscle group on whatever you worked is enough, at moderate pressure. Rolling after hard exercise is linked to less soreness over the next two days. ### 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. ## More Free Tools [▶️ ### Body-Area Session Player Guided roll and stretch session Try It Free →](/tools/body-area-session-player)[🏋️ ### Foam Rolling Routine Builder A timed rolling routine for your areas Try It Free →](/tools/foam-rolling-routine-builder)[⏱️ ### Recovery Time Calculator Recovery time and soreness timeline Try It Free →](/tools/recovery-time-calculator) [View All Tools →](/tools)