Spinning app for android/efficient gym cardio circuit?

nekoface

My spin classes are expensive. Really expensive, at about £95/month. I spend quite a bit on other fitness things like yoga (also really expensive, wtf) and a martial arts class...and I'm partial to going to random dance classes and buying cool gear. I love the spin classes but I'm saving for a holiday at the moment so I'm gonna have to cut down on expenses a bit. By expenses, I mean spin class.

I tried classpass but I like to work out everyday near where I live and a max of 3x a month per studio doesn't cut it for me. It's also just as expensive and I'd need to pay for my martial arts class on top of that anyway. So.

I decided to suck it up and spin on my own at an inexpensive gym. I've been looking hard for a spinning app for cardio. I tried an indoor cycling app (Indoor Cycling Coach) but...I don't really understand what it wants me to do? And it pauses every time I change my music. It kinda sucks.

Do you have a spinning/indoor cycling app that you like? Part of why I like spinning is I can stop thinking and just obey the man who shouts instructions at me. I burn a lot of calories and on a bad workday I still feel like I've accomplished something.

Failing that, is there a particular efficient (30-45 minute) gym cardio circuit that you like and follow? I run but I like to have a regular cardio exercise that's lower impact on my knees that I can do daily.