Post acl exercise?

Depends : If you had surgery, you should follow you'd doctors protocol. If not you want to emphasize full motion, and straight ahead activities, if your knee wobbles or locks it should be checked and surgery considered.

Motion.: Range of motion exercises are the most important, to minimize the chance of scar tissue forming. Strengthening of the quads, hamstring and other lower extremity musculature is critical to regain strength.