lymekiller, thanks for the input, but most of us know how this disease works. You can still have leg weakness with MS. It can occur from atrophy from a brain issue. The brain doesn't send the message, the muscle stops getting used and then you get atrophy ya know. Sometimes the atrophy is very localized and you can build up the muscles around it to compensate. Just like if you have spasticity (also from brain disfunction) you can still stretch those muscles and ease the spasticity.
The exercises I do: 1) I do deep knee bends also called squats. I do these with and without weights (be careful, you have to have good knees). 2) I also stand on the edge of a step and do lifts with my calf muscles. 3) I do leg lifts from my side. I lie on my side and raise my leg straight up. I do this lying against a wall so that I don't cheat by pulling my leg forward of center. I check my position by checking that my heel nearly touches the wall behind me. Those are the ones that my PT indicated that I needed. The one I am constantly doing....literally three or four times a day are the squats. I do a ten at a time. I pause at the bottom to make the muscles work harder. I do these very deeply......it helps stretch the spasticity at the same time. I use to have to do this in the kitchen so I could spot myself with the counter at first. I would pull myself up with the counter. Now I can just stand up from a deep squat.
I hope these help. If not, try to get some time with a good PT. Mine happen to have MS herself. She was outstanding at evaluating muscle weakness and telling me exactly what to do. She then checked that I was doing the exercise exactly the correct way.