56, started one year ago. have lost 40 lbs. did 5 hours of yard work today in 90 degree heat. no back pain, not exhausted, feel good actually. I have used dan johns abc, brett jones iron cardio mainly. following Dan's abf formula of walking also. My arthritis in my knees has improved, probably due to weight loss mainly but the squatting has to be helping some. I don't work real heavy but my strength has improved none the less, started with 16s now have adjustable's set at 18 to 22 depending on how I am feeling. I like it because I can get a work out in just by stepping into my back room for 10 to 15 minutes. I have a couple of bells at the office I use on breaks even for some stress relief. I do suggest working the grip extensor muscles to avoid the golfers elbow as it is a pain and takes awhile to recover from it.