Way late to the party for me. I used to do a lot of bodybuilding training when I was younger and not riding. 57 now and with severe lumbar stenosis (thank you heavy squats and leg presses). I am currently lifting weights 4 days a week and mix between heavy and light days. With the back situation the legs get some strength training but size and strength in the quads is usually maintained with cycling - I like to ride hard when I'm on my own and build the lactic acid in the legs. Cycling is the one relief I have to the constant pain in the back and legs. I have doubled efforts on the strength and cardio this winter after prostate cancer surgery a year ago and rising PSA numbers leading me down the road toward probable radiation treatment later this year. I'd rather have my body as strong as possible before that happens.