I have MS, I use a walker around my house,but when outside i use a wheelchair, my question is Will I be welcome to strengthen the mobility in my walking at planet fitness?

I have disability, osteoarthritis do you have fitness program for people who have cartilage in knees

Yes you should be able to. They have plenty of stationary bikes, treadmills, and ellipticals.

There are people who walk around the gym while holding light weights. The aisles around the equipment are wide.

Yes