A large group game that works well for focusing a group in an active way. Jockeys works with any age and any number, as long as you have space!
When working with young people, knowing how to lead games well can be a real string to bow and helps a lot with behaviour management.
How important is health?
Health is an important value, but not an absolute one. We should treat our God-given body gratefully and carefully, but not be obsessed with it.