Thanks everyone for your opinions and thoughts:
Poppers: Sounds like the TG worked out well for you. You mentioned building strength, keeping muscles limber and stretching. That's what I'm looking for. (Don't get along well with bicycles).
Bluesapphire: I agree with you. I love swimming above all other activities. At this point in time I am still mobile enough to schlepp down to the local Y and swim in the pool. My hope is that the gait disturbance and balance problems will not get any worse. But if they do, something like the TG might be an option when I can no longer get to the Y.
Maputo: You're right about going to the gym. That's the best thing to do when you are mobile enough to do so. Fortunately, I can still get there and use their pool. The TG would be a worse case scenario option.
Peaches: Thanks for the kind words.
Outlaw: If you want to see an example of my walking skills, check out Larry the Cable Guy's YouTube called, "Walmart After 2 AM"