It's tough to do a study and determine whether Americans are "lazy" or brainwashed and burned out by competitive consumptionism (and sugar). Children are indoctrinated to blindly compete as soon as they can talk. Just like ChatGPT learning about reality from the polarized antagonism on the internet, our last several generations have been learning from biased advertising, not physical reality.
It's hard to not be lazy when only a tiny percentage of people actually achieve the state of being that advertising demonstrates as 'success'.
A life of "no pain, no gain" gets old quick when the gains are so much less than the pains, and so many profits are extracted by so few from so many people being in pain.