james_edin said:

Gym confidence after training weight loss: walked into a gym for the first time in 8 years yesterday.

This is exactly what I could not find anywhere else.

From the other side of the consultation, briefly. If two explanations both fit, the useful question is which one predicts something the other does not. That is answerable; arguing about which sounds more plausible is not.

sean_dublin said:

The version of this that has an answer is narrower than the version being asked.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. Pushing back on the anecdote-stacking. Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.

That is the short version; the long version is somebody else's post.

The figures, for anyone assembling their own picture. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.

Moderator note: the sourcing question belongs in the vendor section and has been split out.