Workout Set Timer & Log

About rest-time interval timers

Rest time between sets is a key variable in strength training — too short and fatigue prevents you from lifting effectively on the next set, too long and you lose training density and momentum. This tool combines a rest countdown timer with a simple set log, so you can time your breaks and track exercise, weight, and reps without switching between a separate stopwatch app and a notebook.

How the timer and log work together

Logging a set (exercise name, weight, and reps) automatically starts the rest countdown using your chosen preset or custom duration, and a beep plus vibration alert you when rest time is up, so you don't need to keep glancing at your phone. The tool also tallies total sets completed and total volume (weight × reps summed across all sets) as you go, giving you a running summary of the workout.

Frequently asked questions

What rest duration should I use between sets?

Common guidance suggests shorter rests (30–60 seconds) for muscular endurance and metabolic conditioning, moderate rests (60–90 seconds) for hypertrophy-focused training, and longer rests (2–5 minutes) for maximal strength or heavy compound lifts — but this varies by exercise, load, and individual recovery, so use the preset that fits your specific program.

What does "total volume" mean in the summary?

Total volume is the sum of weight × reps across every set you've logged in the session — a commonly used rough proxy for total training workload, useful for comparing effort between workouts even when the specific weights and rep schemes differ.

Does the timer keep running if I switch to another app or lock my phone?

The countdown and alert rely on the browser tab staying active, so if your phone locks or the browser is fully backgrounded, timing may pause — keep the tab visible or your screen on during rest periods for reliable alerts.