Hey Marlene and Mark,
I have the philosophy that the MD is going to make my life miserable no matter what I do. I have always been a very active person, and I decided that I have nothing so lose, so I attempt to work out every day. (I have not been as dilligent lately but I will get to that further down).
I started physical therapy in an indoor 93 degree heated pool in May of 2007, and in July of that year I also bought a recumbent exercise bike. Once my PT ran out I joined the "clinic" as a gym member, and decided to keep going to see what would happen if I exercised daily I had nothing to lose. It has now been nearly four years, and so far the MD has not progressed, actually quite the opposite. I used to have to use a chair lift to get into the pool (because of the way the stairs are set up, they 1.5 times taller than regular steps, I am fairly short, and the railings are to far apart), but I am now able to get into the water with the only assistance of one of the PT's arm as a railing. I have been able to not only increase the reps on my exercises, but I have also been able to add weights to my feet and increase the resistance on the dumbbells I use. In addition to that I have added cardio to my exercise routine in the water, and can "jog" for an hour and a half without fatiguing myself. At night I attempt to ride my bike for a while. I have achieved similar results there, when I bought the bike I could barely push the pedals at level one for five minutes, I had to use my hands to support. I can now go for an hour to an hour and a half at level four with no support. My entire medical team is impressed with what I have done. However, there is always a however, haven't you noticed? I think that most of my results are due to increased strength in the muscles that are not affected by the MD as I have not experienced as much of a progress on land as you would think. My PT friend says that is not true, and it may be because I want it all and I want it now.
OK returning to my comment about dilligency, it has been really cold here in North Florida lately, and even though the pool is heated and indoors, going there when it is cold outside just isn't nice as I get really cold getting to and from the car when going. In addition to that I have been fighting my stupid old depression again, and one of the things that happens when the chemicals in my brain decide to go haywire is that I lose all motivation to go there (or anywhere for that matter). I get tired of my friends there etc. So far I have not felt an decrease in my strength despite only goine about once every one of two weeks, but I know that if I don't get my motivation back soon, it will catch up with me.
My suggestion is that you look into whether or not there is a heated therapy pool in your area and check it out. It really is a good low impact way to get in a good workout.