Name: Pomodoro Timer - Focus Break Cycles
Author: RiversideArt

Pomodoro Timer cycles focus, short breaks and a long break. Defaults are 25 minutes of focus, 5 of break, a 15 minute long break after four sessions; all are set in the Garmin Connect app. It can start the next block by itself or wait for you.

A buzz and a beep mark each change.

Controls:
Select or tap: start or pause
Down: next phase
Up: back to the start of the phase
Back: pause
Menu: reset (press twice once it is running)
Vibration and beeps at each change can both be turned off in settings.

From the same developer: HIIT Timer and Round Timer for workout intervals, Match Timer for sport halves.

Free to use, with no permissions asked.