Having more lean body mass will allow your body to function at a greater metabolic rate - meaning your body will burn more calories, also release hormones faster and have faster functioning in general. You are correct that you are not helping your heart and lungs directly (unless you are doing quick training that elevates your heart rate) but you are far better off than if you were overweight putting more strain on your joints and having impaired function within your systems.
My biggest cardio surprise came when I started running and cycling after bodybuilding - it was really tough. But I think having that extra lean mass also helped my body take the strain of endurance exercise much better.



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