♪alt13
Well-Known Member
But they don't build a lot of muscle. Any exercise that you can do for 30 mins won't help you build muscle (or not much of it). For example. I remember reading some research comparing high rep to low rep exercises. After 6 months of high rep lifting, there was an increase of something like 3% in muscle mass. That compares to more than 10% for low rep until failure exercises.
But if maximizing muscle building is not your goal, then rowing is a great exercise.
I've heard a similar thing about cardio. That you get better results sprinting with a few breaks in between then you will jogging for an hour.
My understanding is that human beings are actually really efficient and have great stamina. We were built to cover long distances at a steady pace and actually burn less calories than you would think doing so. Maybe he's rowing but not actually pushing himself into a true cardio workout. Maybe he's spending too much time doing it at too slow a pace.