Show HN: Programmable timer web app (for gym workouts or stretching sessions)

Over the last couple of months, I’ve been building a timer web app for myself that I use for workout and stretching sessions. My main use-case is gym routines that consist of repeatable sequences, e.g. where you are holding certain positions for a set time (rinse and repeat). The app counts down the program, beeps, and reads the activities out loud.Two things (I suppose) are special about it:- The timers are “programmable”, so you can freely ex…