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In fact, a recent study involving men in their 50s to 70s investigated the effects of completing a resistance training regimen, followed by a detraining period, then a retraining period, each consisting of 12 weeks.

They had hopped on in Denver and would detrain at the end of the line.

The “detraining effect” for aerobic endurance is even faster than for musculature.

“But much of the loss and return to fitness is relative, and tied to your level of fitness prior to detraining.”

I wonder what my ancestor from Scotland thought when he detrained at Los Angeles in the 1880s to take ownership of a farm in the San Fernando Valley nearby.