I'm 69 and have a concept 2. Most of my rowing is done during cold winter days, supplemented by the trainer. I'll use it in warm weather if its rainy. Concept 2 has some good workouts, but I tend to use YouTube for training. It's a cardio workout for sure, but when done properly works your legs a lot. When I started, I'd row the cadence that the instructor was doing and find out that he'd ridden say 5k at the end, when I'd have 3k to show for it. Good rowers push with their legs really hard, and your quads will feel it. Also, a nice zen type of activity and I'll sometimes just put on some classical music and row easily for an hour. If the day comes when I have to quit cycling, I'll still be rowing.