What are some good health and fitness related prize ideas?

I’m starting a point-based fitness club at my school and need some good health and fitness related prize ideas for both individuals and groups of about five people. It would be very helpful if the prizes were cheap and gender neutral.

What is a good first message to post in a health and fitness group?

This is my first time as a moderator. I am trying to post a message on my Health Zone group that will act like an ice breaker for new members to open up and share a little about themselves. My goal is to have hundreds of people join this group and for them to share there experiences in health and fitness.