Hello there,
You mentioned you require an android app for your gym. If that is a simple app to showcase your gym then it would be a very simple app that requires not more than 6-8k based on the number of activities you will be having.
If you need a robust app please PM me and I will let you know the corrected price.
And myself, I am good with developing static android apps and also REST API based Cloud Connected apps for Android. Look at my user reviews to know about my previous work.
I wish you consider my bid.
Thanks & Regards
Amarnath Maddireddy