I am not a bodybuilder or fitness expert by any means. However i do go to the gym 4 days a week. My 63 year old father joined me for 6 months and was doing great. We were seeing good results too. Please keep in mind this man never worked out a day in his life so i kept it really simple and easy because i wanted him to come back. I broke it down like this for him. Day 1 Back, Day 2 Biceps/Triceps, Day 3 Legs, Day 4 Chest. These would be low weight high rep workouts. A lot of our workouts were focused soley on getting his range of motion better. He couldnt reach down and tie his own shoes when we started. I also had him do 1 mile on the eliptical to start our workout. This was a very easy workout. Unfortunately he caught pneumonia and covid and I havent been able to get him back in the
Gym since. I think mainly he got lazy again and he probably was doing it more for me than himself. And we all know if you are motivated to help yourself, you will never do it.