Here are two helpful links on ACL injury prevention
This prevention program consists of a warm-up, stretching, strengthening, plyometrics, and sport specific agilities to address potential deficits in the strength and coordination of the stabilizing muscles around the knee joint. SMSMF PEP PROGRAM
The program was developed by an international group of experts, and its effectiveness has been proven in a scientific study. Teams that performed the “FIFA 11+ ” at least twice a week had 30-50% fewer injured players. http://f-marc.com/11plus/home/
A concussion is a type of traumatic brain injury that changes the way the brain normally works. A concussion is caused by bump, blow, or jolt to the head or body that causes the head and brain to move rapidly back and forth. Even a “ding,” “getting your bell rung,” or what seems to be a mild bump or blow to the head can be serious.