Definitely not lighter. I don’t recommend a heavy workout to people of a certain age who do not have the know how, but I challenge myself fully. After 20 years as a fitness trainer, I know how to push the limits in a safe way. The three day system is a good one, and one I used for athletes. For the average person, and I now count myself in that category, I prefer to use total body.
“Definitely not lighter.”
Do you fully recover between workouts? Are you able to sustain 2x weekly?
I don’t think I could sustain that pace. For each group I need a full week to recover. And as I approach 70yrs I find I need two days “off” a week, one of which is low and slow cardio.