Four beeps to the minute, a quarter-minute apart: fifteen seconds is a comfortable window for a paced drill round, a short hold or rest, or a task you want nudged along without watching the clock. Slow enough that each beat means something, quick enough not to drag.
Counting in quarter-minutes makes a session easy to plan: four beats is a minute, sixteen is four. Run it for a fixed block, or leave it looping in the background while you work through the rounds.
The workhorse pacing beat: one beep every 10 seconds, on repeat, for drill rotations, held stretches, and repeating lab steps. Doubles as a 10-second buzzer.
A roomy beep every 20 seconds, three to the minute, for paced drills, holds, and steps in a process. Loops in your browser, no install.