Make sure your dads start out slowly. Learn the form and take time to recover. Having a bad back is all the more reason to work out. It is often the sedentary lifestyle that causes bad backs. Care must be taken to not do too much too soon. Rippetoe’s program is definitely where to start. I disagree on the leg press. it’s an OK accessory lift but squat variations like front squats and overhead squats, with very low weight of course, will do more to strengthen the stabilizer muscles in the back. As much as you can stick to closed chain free weight movements. That way the whole body can be trained as a unit. Body weight movements should also be used. Also, pay attention to flexibility and balance issues. 50 is a little young to be worried about balance but in some cases it’s an issue.
I also take offense to the idea that a man in in 50s is an old man.
LOL…I just call him “Old Man” it’s a proper name not a derogatory term!
Unfortunately, I think he only has access to free weights (DB’;s up to 60lbs, which he thinks is a ton of weight bless his soul) and a nautilus machine.
I was thinking of having him do the 3rd world squat for a few weeks to develop his form. As well as start with the standard body weight exercises, push ups, dips, bw squats.
Nothing that’s going to takle more than about 20-30 mins.
What do you think stu, anything else to add for now?