So I know there's a few gym applications out there but im doing one for fun and also to sell it to a local gym that want me to do it...
I already have some ideas for the application but want some advice from you guys...

What features would you like to see on an application like this?

- To-do daily rutines with timer and weights.
- Nutrition plan (diet).
- Badges/Prices like points and stuff that can be changed for extra free days on the gym (bacon system alike).
- Monthly improvements with charts.
- Gallery of excercises based on goals set on configuration.
- Background music (and motivational voice maybe dk about this).
- Calendar.

Anything I missing? the application will also make use of an Restful API to pull the data of users/gyms/diets/excercises/ etc.

+rep for any feedback, cheers!