An Ambassador for a fitness brand requires various deliverables to be done.
Your focus should not be on how is he performing and what you're paying to him , but about what is he doing and what do you expect from him.
Your brand name and your brand publicity is associated with the name of the ambassador.

I would love to talk to you about it. You can approach me on Instagram : bing_chandler61200

Would love to help you , not charging you much :)