A sports trainer or coach is the perfect work at home job for a teen who is athletic and loves teamwork. As a coach, you will help teach safety, exercise, and a specific sport to children younger than you. You have spent many years of your life receiving good coaching on the sport that you love, why not share that training with others and make money while doing it.
The most important safety tip in coaching is: Never Ever, under any circumstances, put the child in danger or allow the child to perform any dangerous tasks. When in doubt - just don't do it. Keep the game clean, safe, and fun. The best advice is to have a rule of your own that at least one parent must be present at all times while the child is with you. Have the parent bring a book or laptop and keep the coaching sessions to an hour or less.