Will I Run Again?

I'm 34 years old and my body isn't like it used to be. Two years ago I had a partial ACL tear in my right knee, and my running has never been the same. I didn't have sugery, and decided to go with physical threapy. Six months of rehab helped and I was back to running, but one day I reinured to knee. I can still run. The stability in my right knee is solid, but I do have acute pain when I run. I've considered joining a gym to go through the rehab exercises to strenthen my knee again. If I can get at least two soild months of building up the strenth in my knee, I belive I should be back. Or maybe I go under the knife.