That makes sense, thanks. So the claim here is that exposure to a force similar to Earth gravity for "a few laps a day" would prevent/reduce whole-body deconditioning?

I guess that makes sense too, since a few reps of weightlifting every couple days is enough to trigger muscle growth and bone densification.

Our bodies are exquisitely optimized for the surface of the Earth. Any deviation from that (gravity, sunlight, gas pressure, gas composition, radiation, etc.) is likely to be deleterious.

This does not bode well for expanding out into the solar system. It might only work if we do some genetic engineering to make off-world habitats more habitable.