Hmmm! I am not in great shape like you at all, couldn't even do a 5K walk much less run a marathon like you, and after 5 minutes at level 10 and 29.6 spm I wasn't even breathing hard. Maybe perspiring a little, but not really feeling like I had been putting much effort into it. Felt like I'd been coasting. And I think the machine is cool.
I suspect it's a matter of different strokes for different folks (literally? just that maybe some of us are more naturally inclined for big muscle exercise like the C2 and others maybe more constitutionally suited to running)
http://www.youtube.com/watch?v=AKPtTwhgII8
Here's a video of a guy doing 30 spm for 90 seconds, but not at level 10. If this looks like you at level 10, and you can do this for 5 minutes without breathing hard or feeling like you've done much of anything, my hat is off to you. 30 spm is a race pace for serious rower. On one serious racing forum, 30 spm for 20 minutes at level 10 on Concept2 was described as an exhausting piece of work. Bear in mind that I can do 5 hours, 100 miles, at a sitting on a Schwinn Airdyne Pro - so if you can seriously do what you say you are doing, perhaps you are a budding Senior Olympian. The Concept2 is notorious for people (including gym "experts") having no clue what it's all about. On one forum where a guy reported that he had "no problem" doing 30 spm and sent in a video, the experts responded that he was merely "lifting weights with a bicycle chain" and not actually using the Concept2 at all.
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