yes, I agree the book seemed to be trying to sell the older crowd on getting back in the gym, but I was hoping the studies he cited would apply more universally and have more correlation to his specific recommendations than they turned out to. I suppose I too am guilty of looking for an excuse not to don my sneakers every morning.
I was also thinking of trying combining different movements, weights, speeds, and reps into my workouts, but I'm having a hard time engineering a solid plan that will cover everything but not take more than 2 hours. Being well adapted to ketosis keeps me from getting tired in the gym, but usually around 2.5 hours my muscle strength bottoms out and I'll have to stop. Which is still much better than when I was glycogen dependent. I would run out of steam, lose strength, and be full of lactic acid soreness at about 1.5 hours.