While a physical job certainly helps in being active, it typically doesn't really get your heart rate up for a sustained period. It is not really a substitute for the health and fitness benefits that you get from a more focussed cardio workout.
Improving his fitness through exercise will actually help him meet the demands of his job, and leave him less tired.
But I get that his physical job currently leaves him pretty tired, and going to the gym after that can seem unattractive. Perhaps one option would be to do more focussed exercise on weekends, rather than during the week.
Another option might be to do something moderate, like going for a 30 minute walk together in the late afternoon/early evening?
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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