Wear Protective Gear
Cover yourself as much as possible, thick wetsuits, and helmets, booties, gloves etc.
Serious injury can occur from impacting parts of the gear
Learning to foil can be likened to dancing on top of a loaded mouse trap. One false move and the foil can jackknife suddenly, bringing you in contact with the wings. It is almost impossible to prevent this type of wipeout from happening indefinitely. But you can lessen the frequency of accidents, with proper preparation and training.