I joined a gym this summer. I'm 63 male, 5 ft 11 & over weight. I was 260 lbs, but it's down to 246 lbs now. I have been focusing on cardio work outs, for past two months. I've had a total knee replacement so no running or squats! I use an elliptical or arc trainer for my cardio sessions. Mon-Wed -Friday are my cardio-days. Fridays I change up the cardio with a HIIT session on elliptical. I'm doing 40 minutes, & about 700 calories burn per session. For past month Tues & Thurs are strength training days. I'm doing 3 sets of 8 reps. Lat Bar Pull Down 150 lbs Bench press : 150 lbs Seated Row : 150 lbs Over head Press: 150 lbs Seated Leg Press: 200 lbs Back Flexing machine: 125 lbs 25 reps Upper ab crunch machine: 3x 10 & 125 lbs. I have had some history of lower back strain so I'm staying away from Dead lifts for the time being. My goal is to improve my overall health, trim the fat primarily, preserve & improve my strength & muscle mass. I am not sure at my age what gains in strength or muscle mass are reasonable. I do not seem to be making any gains with my strength, ie cannot get more reps or higher weight. I could use some help? Should I try higher weight, less reps?