Plan an interval session
In the Tabata timer, each round has a Time on interval. Time off is placed between rounds, and the final rest is optional. Prep time is a separate countdown before round one. That structure works for any exercise you want to pace by work and recovery blocks; it does not prescribe an intensity.
For eight rounds at 20 seconds on and 10 seconds off, with no last rest or prep, the total is (8 × 20) + (7 × 10) = 230 seconds, or 3 minutes 50 seconds. Including the last rest adds another 10 seconds. This matters when fitting the session into a larger workout.
Plan reps by lift, hold, and lower
In the Gym timer, a 2-second lift, 1-second hold, and 3-second lower add up to 6 seconds per rep. At eight reps, that is 48 seconds of paced work per set. For three sets, there are 144 seconds of paced reps before adding preparation and any rests the program schedules.
Choose a tempo you can perform with control and appropriate form. Timing describes the movement; it does not tell you what weight to use or whether a particular exercise is right for you. If the planned pace makes your form break down, change the plan rather than chasing the countdown.
Use progress as a guide, not a target to rush
The Tabata progress bar shows work and rest across rounds. The Gym progress bar tracks sets, while the large countdown names the current lift, hold, lower, or rest phase. Both timers can be paused when you need more time. Editing settings resets an active session, so set up your plan before pressing Start.
On a phone, fullscreen makes the phase and controls easier to see. For Gym sessions, rotating the phone sideways puts the countdown alongside the current exercise and set information. Native fullscreen availability depends on your browser; the Gym timer has an in-page fallback.
Keep safety decisions outside the timer
Warm up and choose exercise intensity based on your own circumstances. Stop if you feel unwell. These tools provide timing and pacing, not a medical assessment or a personalized training program. Sound cues may also depend on browser audio permissions.