To view a longer list of Amazon products click Bowflex Exercises
Bowflex Exercises are probably as close as you can get to a real workout. Nothing beats free weights or strenuous physical work, like digging up rocks, like I mentioned in my About page.
Bowflex is the brand name for a series of fitness training equipment, marketed and sold by Nautilus Inc. and is based in Vancouver, Washington (horrible state). The first product they sold was in 1986.
I have never tried Bowflex, but I've watched videos on how it works and it probably does work, at least to a certain degree.
If you choose to go that route, opposed to free weights, know that you are paying partly for the name.