And when this happens to you for the first time, the frustration can build. Imagine going from getting better just from doing the warm-ups, to now it taking a few months for you to see/feel as though you've made even a modicum of progress.  What's wrong?  Are you getting worse?  Or is everyone else getting better at a faster rate?  Why?  And as with lifting, people might change their programming (how much they drill, roll live, take class, etc.), or just quit out of frustration.