There are 2 different types of injury you can get from sport:

1. Chronic

Caused by continuous stress on a certain body part over a long period of time by overuse

e.g. Tennis players can develop tennis elbow (an inflammation of the tendons in the elbow due to overuse of certain arm muscles)

e.g. Long distance runners can develop shin splints (a bone injury in the front of the leg)

Risks of this type of injury can be training too hard, not enough rest, poor footwear or bad technique

2. Acute 

Caused by sudden stress on a body part, such as a fracture, pulled muscle or concussion

Can occur by colliding with an opponent, being hit by something or falling from a height or with speed.