Here is the sentence that confused me
The work helped keep calcium in his bones in spite of free fall.
It comes from https://www.reddit.com/r/HFY/comments/976wsz/the_road_not_taken_part_2/
I know, "free fall" means an occasion when something or someone falls quickly under the influence of gravity
But, what does it mean in the sentence?
Did he fall?
Does it mean that this work helped keep calcium in his bones in spite of his fall?