Stop in for a cup of coffee

Just came from my last physical therapy session

They want me to go back because they are saying I have "knee valgus"

I never even heard of that before but he showed me how when I stand straight and put my knees together, my ankles tend to go outwards.

I didn't know it's a problem because I feel fine and I can walk and run (not very fast) but i can still move.

He then told me to sit on the floor in front of him and so I sat down and he says i "w sit" which isn't good but its pretty natural for me, been doing it since I was a kid.

I think they are just trying to get more money.
If you don't trust him, then go to the doc that gave you the referral.
I've had good luck with physical therapists. It's like going to the gym but having a person who really knows what their doing to give guidance.