DD had a coach that "prayed" over each gymnast at the end of each practice and did a group prayer before each competition. Honestly, it made me uncomfortable. First of all, it's presumptuous as hell. Secondly, it isn't the appropriate place. Thirdly, it felt exclusionary to other belief systems.
I am an atheist and my daughter doesn't believe in any gods despite being exposed to multiple types of religious belief systems. I wish I had a picture of the look on her face the first time her coach put her hands on her in prayer. It was hysterical! I always resented the coach foisting her religious beliefs on my family.
If I want prayer, I'll go to church. I'm paying for gymnastics instruction. That's what I expect. I respect the fact that coaches are people and many are religious. However, I would want that part of their life to remain personal because I think religion is personal.