Racket: please control the use of the racket. Kids swinging the racket freely near other kids can easily injure other kids. That is the primary safety precaution in any clinics/group classes that an instructor must foresee!
Injury prevention: stretches and warm up exercises of small duration precede any classes. Teachers must be aware to include them in the schedule, mandatory for each class.
Contact assist: in the event of any painful contact with any object, there is a simple assist that will help blow the pain and accelerate the healing of the affected body part. Have the person show you how it occurred and repeat gently over and over the action until the child is no longer interested in the pain or the pain disappears.