React Native Fitness App Help

I’m building a cross-platform fitness app with React Native and TypeScript and now need an extra set of hands to finish the workout side of the product. The focus is on a robust workout tracker and planner where users can log every set, rep and weight.

I have the design ready and just need someone to help out to on the coding side. I am a senior mobile dev so I will be mentoring you along the way and do PR reviews. This is a self funded project so I will be paying out of my own pocket. I don't have a huge budget but the benefit is that you will be working with senior mobile devs who have been working in the industry since 2019.

In your proposal, I don't need to see your past experience. Please let me know:
- what features you are interested to see in a fitness app
- what issues you are seeing in most fitness apps
Let's keep it short, thank you!