Timer Plus - Workouts Timer 4+

I started out thinking 4 stars but bumped it up to 5 after looking through all the settings and other functions and, also, noting the great looking—easy to read displays. You don’t have to look at the screen but if you like to it’s very easy to read. I haven’t used it yet but I’ve looked it over and done a short test drive. It seems to be exactly what I want. It allows me to adjust the timers and counters to get exactly the workouts I expected for my outdoor rides. I’m sure it will work great indoors if your stationary doesn’t already offer the programming you need. There is a pyramid workout attributed to Mike Rowe in a Bike Radar article that I would like to try but I don’t think it would be doable with any simple app. (At least, I couldn’t see a way.)

Exactly what I need to perform home physical-therapy exercises — five sets of six 10-second contract / 10-second relax repetitions with 30-second rest between sets — without having to visually monitor the timer. The audio cues free me to watch/read other things while performing the exercises.
The graphic user interface is great should one want to watch the timer. Big, bright, and bold. Very easy to read on a smartphone screen.
I’ve only used the timer once, but thus far I couldn’t be more satisfied.

The app interface is awesome - big obvious and buttons (great for clumsy workout hands), and has very clear very customizable interval settings. This would be the perfect app but for the bellow:

The app deceases your phone/music volume while running the interval, even if you have sound settings turned off. If you pause or complete the interval, the volume jumps back to full volume abruptly. Even worse is if you leave app sounds turned on so you don’t have to watch your phone, your music volume is decreased while in use but the app sounds (buzzers) still play at full volume and scream in your ears if you’re using headphones.

Tried to message app support to suggest a bug fix but the support link just takes you to their product webpage and there’s no contact form, just a signup page.