Gym client plan software

I have a medium size gym and want to take it to a new level. I'm looking to hire a coder/s to make an app where customers can login with their phone to see their profile in the gym. They will have access to: - current and past evaluations (body weight, etc); - current and past workout routines; - their personal info like payment day, insurance term, username and password change, etc In the admin area which can work with php/sql, our team will be able to make workout routines (must have a way to pre-introduce all exercises, so when they are creating the customers routine, they add the exercises that are already in database. We already have a gym manager software made by a friend that uses php and sql. Customer database should be the same. Any additional info about this project, please ask!