Quite like the effect of microgravity on the skeletal system, or the effect of rarely exercising on the muscular system, or the effect of rarely elevating your

Quite like the effect of microgravity on the skeletal system, or the effect of rarely exercising on the muscular system, or the effect of rarely elevating your heart rate on the cardiovascular system. Periodic small shocks are necessary for any biological system to remain in good shape, because those small shocks are a form of information about what needs reinforcing. Without those small shocks, the system atrophies and is unprepared for large shocks. True of the immune system as well, I think.