Name: The "onlyTimer" you need
Author: Dschinni

Interval training and plain countdowns. The remaining time fills
the screen, and two rings show where you are — one for the current
block, one for the whole session.


SET UP A TIMER IN YOUR BROWSER

https://novacat1973.github.io/onlyTimer/tools/onlyTimer-String-Builder.html

Click blocks together, name them, set the seconds, pick a colour.
Repeat groups are explicit, so a warm-up and cool-down run once no
matter how many rounds you add. Press Generate string, then Copy:

  1. Garmin Connect -- Connect IQ Apps -- onlyTimer -- Settings
  2. Paste into "Timer config string" and save
  3. Sync — the timer appears in the list on your watch

Reusing a name replaces that timer. Separate several with a tilde.


ON THE WATCH

  START/STOP   start, or pause
  BACK/LAP     first press resets, second exits
  UP (hold)    open the timer list
  DOWN / UP    skip to the next or previous block

Pick a timer and it starts straight away. Quick timer sits at the
top of the menu for a plain countdown in two presses.


WHAT YOU SEE

Large custom digits that grow once you are under a minute. Blue
ring for the session, block-coloured ring for the current interval.
Block name and round counter, e.g. WORK 3/8 — warm-up and cool-down
never count as rounds. Session time left, heart rate, temperature,
24-hour clock. Heart rate and temperature switch on per timer.


SOUND

Mid beeps over the last three seconds of a block, then a high tone
entering work or a low tone entering rest — so going hard rises and
easing off falls. Every beep vibrates, and a per-timer option
alerts you even when the watch is muted.


RECORDING

Optional per timer: saves a FIT activity with a lap at every block,
so your splits match your intervals.

Permissions: FIT for the activity file, sensor history for heart
rate and temperature. Nothing leaves your watch.