Just want to mention that I am a strong proponent of glucosamine/chondroitin. My knees started going bad pretty fast in my late 40's, early 50's. After a couple of years of standing by (no pun intended!) watching them go bad, I researched supplements and started on a heavy dose of the g/c. The deterioration stopped! Well, almost. It slowed so much that they have stayed *almost* the same now for about 15 years. I stop and start other supplements, but the g/c is every day!
The treadmill is/was one of my go-to machines but, during the last year, I have noticed that if I do a mile on the treadmill every day I develop leg pains; if I lay off the treadmill, the leg pains go away. When I told our GP about this, he recommended I get an elliptical. Now I have found that if I do the elliptical every day, I develop back aches. I will probably have to alternate machines to avoid those side effects.
I would absolutely love to have a personal trainer, but we live out in the boondocks. There is no gym I could join that is closer than a 30-minute drive away (in good road conditions), and honestly I cannot justify the cost of having a personal trainer come to the house -- not with all the other expenses we have at the moment.
Again, thanks to whoever recommended checking out DVDs on Youtube! The previews really helped me sort out DVDs I would probably enjoy from those that I would watch once.