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.<p>Two things (I suppose) are special about it:<p>- The timers are “programmable”, so you can freely express your own routines and procedures in a declarative notation.<p>- The app is all static (no backend): the entire program is encoded in the URL and can be bookmarked or shared&#x2F;transferred via QR-code.<p>You can check it out at <a href="https:&#x2F;&#x2F;timer.jotaen.net" rel="nofollow">https:&#x2F;&#x2F;timer.jotaen.net</a>, optionally with a demo program pre-loaded: <a href="https:&#x2F;&#x2F;timer.jotaen.net&#x2F;#demo" rel="nofollow">https:&#x2F;&#x2F;timer.jotaen.net&#x2F;#demo</a>.<p>Source code is at <a href="https:&#x2F;&#x2F;github.com&#x2F;jotaen&#x2F;timer" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;jotaen&#x2F;timer</a>. I’ve also written up a small behind-the-scenes on my blog: <a href="https:&#x2F;&#x2F;www.jotaen.net&#x2F;SAKxq" rel="nofollow">https:&#x2F;&#x2F;www.jotaen.net&#x2F;SAKxq</a>