Everyone in a vehicle should wear seat belt. Children under 12 should always sit in the back seat. Infants, toddlers and children - according to their weight - should use child safety seats or booster seats.
Helmets should be worn in all action sports like, biking, skiing/snowboarding, skate boarding, roller blading, etc.. It is also important that they fit properly.
Studies have shown as you get older if you exercise and keep your muscles tone, you are less likely to lose your balance and fall.
Use common sense. Do not climb a ladder while intoxicated. Use a stepstool instead of a chair, install handrails. Use safety gates on stairs, install window guards to keep children from falling. Unnecessary risks lead to accidents.