Some health benefits of playing soccer, according to Better Health Channel, are:

• an increase in aerobic capacity and cardiovascular health
• lowering of body fat and the improvment of muscle tone
• building of strength, flexibility and endurance
• an increase in muscle and bone strength
• a general improvement of health due to switching between walking, running and sprinting.

If you play soccer it's important to try and avoid any kind of injury as best you can. Some ways to do that are: 

• Warm up your muscles and joints before starting
• Maintain your fitness to play well and avoid tiredness and fatigue
• Drink plenty of fluids and rehydrate regularly.
• Do not overexert yourself.
• Always wear the correct protective equipment.