I'm sure this has been requested before but I could not find it.

Currently, the app provides timers for exercises with time-based targets, but there’s no quick way to manually access a timer for exercises that don’t have predefined targets. It would be incredibly helpful to have a quick-access timer feature directly within the Apple Watch app.

This could work as:

A stopwatch or countdown timer that users can start manually for any exercise.
A button or shortcut integrated into the workout interface on the watch for ease of use.

This feature would enhance usability during workouts, allowing users to track their exercise durations on-the-fly without needing to rely on a separate timer app.