I've been doing strength training at the gym for many years. And being a podcast fanatic (its such a great way to learn stuff), I realised that I could easily listen to podcasts while resting between sets. An average strength workout has 30 minutes of resting time combined. In other words, lot's of podcasting time! However switching between podcasts and Spotify for every set was just super painful. So I built an app that seamlessly does it. I'm using wireless headphones, so I built it so that you "shift" when you press pause.
This app has seriously levelled up the value of my workouts now, as I get to learn new stuff while getting a workout. Would love to see if anyone else gets any value from this as well.