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user-inactivated · 3313 days ago · link · · parent · post: Energy expenditure comparison between walking and running in average fitness individuals.
If your circulation isn't even properly going for the first mile, then I don't think you are of average fitness you are definitely of above average fitness. After the first mile I'm in a ditch crying asking myself why I even tried to do that. I'm not overweight, am not really super weak or super strong, but my heart is definitely a bit weak as is most people who are of average fitness.