I started using this app when I was getting bored of my playlist while cycling. It is very well produced, and stimulates your brain while you work out your body.
I also supported the developers by purchasing the book, and it is well worth the investment.
Ultimately, whether you are running, cycling, or working out in the gym, this app will serve you well.
Junior quadro about ZRX: Zombies Run + Marvel Move, v5.1.1