Tool guide

Gym workout timer guide: sets, reps, and tempo

Plan a routine with lift, hold, and lower phases. Calculate rep time and recovery, and learn how time under tension can help you compare controlled sets.

Gym timer guide

Use tempo to keep each rep consistent

Plan sets, reps, and recovery per exercise. The timer calls out lift, hold, and lower phases so you can focus on how long each rep takes rather than racing the clock.

Set the three parts of a rep

For a 2–1–3 tempo, lift for 2 seconds, hold for 1, then lower for 3. That is 6 seconds of movement and hold time per rep. Eight reps take 48 seconds, not counting preparation or rest. Use a tempo you can control with good form; slower is not automatically better.

Plan sets and rest

Each exercise has its own name, set count, reps per set, and rest-after-set duration. Add another exercise to build a sequence. The progress bar tracks completed sets while the main display shows the current phase and the time remaining in it. The total duration updates as you edit the plan.

Keep the plan visible while training

On a sideways phone, use Fullscreen to see the large countdown next to the current exercise, sets, reps, rest, and lift–hold–lower timing. Start, pause, or reset from that view. On browsers that do not support native fullscreen, the timer fills the page viewport instead.

Editing the routine resets the current session. Your routine stays in this browser; the timer is a pacing aid, not personalized training or medical advice.

Why track time under tension?

Make every rep measurable—not a guess.

A rep count tells you how many times you moved the weight—not how long your muscles spent lifting, holding, and lowering it. Time under tension (TUT) adds that missing time dimension. Set a pace you can repeat, and a rushed set no longer looks identical to a controlled one in your training log.

Why measure it? In a 10-week bench-press study, 12 three-second reps and six six-second reps both totaled 36 seconds of TUT per set. The groups gained similar strength and muscle size despite different rep counts. The study did not test whether using a timer improves results; it shows why reps and time should be considered together when comparing sets.

See the TUT study Martins-Costa et al., 2022

Make the time count—not just longer. Tracking your lift, hold, and lower phases makes sets easier to repeat and compare. More seconds alone aren’t a shortcut to muscle growth: a 2015 systematic review and meta-analysis found similar muscle growth across rep durations of about 0.5–8 seconds. Use tempo alongside reps, load, and progress over time.

See the rep-duration review Schoenfeld et al., 2015

Gym timer instructions

Build a routine around sets, reps, and controlled tempo

Give each exercise its own set count, repetitions, lift–hold–lower timing, and rest. The phase display helps you follow that plan one rep at a time.

How to use the Gym timer

Choose the exercise and number of sets and reps. Add exercises to sequence more than one movement. Each exercise has its own tempo and rest-after-set value.
Enter the lift, hold, and lower seconds. For an 8-rep set at 2–1–3 tempo, each rep takes 2 + 1 + 3 = 6 seconds; 8 reps take exactly 48 seconds of timed work, before prep or rest.
Set rest and preparation. Rest is inserted between sets and between exercises when another set or exercise follows; no rest is added after the final set of the final exercise. Prep time comes before the first rep.
Start and follow each phase. The timer shows lift, hold, lower, or rest. Count Up changes only active lift/hold/lower work phases; prep and rest remain countdowns. Fullscreen keeps the large phase display and plan in view. Editing the routine resets the current session.

Example: Three sets of eight reps at 2–1–3 tempo contain 3 × 48 = 144 seconds of rep time. With 60 seconds between sets, add two rests (120 seconds), not three: the planned phases total 4:24, excluding preparation.

Gym timer questions

How is this different from the Tabata timer?

The Gym timer follows lift, hold, and lower phases for each repetition, then inserts rest between sets. The Tabata timer alternates general work and recovery intervals by round; it does not count reps or assign movement tempo.

Will my routine still be here next time?

The routine and its settings are saved in this browser, not an account, so they may not carry to another browser or device. Browser storage may also be unavailable or cleared. Check the plan before beginning.

Does a slower tempo make a workout safer or better?

A timer can help make timing consistent, but it cannot judge technique, load, readiness, or safety. Use a controllable plan appropriate to you and stop if something feels wrong; the timer is a pacing aid, not individualized instruction.