Hi
You are looking to develop a fitness app, I can build that for you from scratch. Provide me the details on chat so that we could discuss further. I am an expert Flutter Developer.
I have been designing and developing mobile applications for over 4 years. Feel free to check my portfolio, you will love my work.
https://www.freelancer.com/u/TheCodeSolutions
Looking forward to hear from you soon.
Thanks.
Shariq