“Next time you want to stay home and watch Netflix, an Aston Martin DB9 gets sad.”
Keepin it serious here. Something motivation-like. Self-created ones include:
“The only thing between you now, and your ideal self, is laziness.”
“Don’t want to now? You’ll have wished you did later.”
“Nothing tastes as good as it feels to be healthy.”
“The feeling at one’s full potential outweighs the struggles on the way.”
I like the last one. It’s broad, short and to the point.