the.com/workout

Paying with sweat now so your future self owes you nothing.

means A session of physical exercise undertaken to build strength, fitness, or endurance.

from Straightforward compound of 'work' plus 'out,' born in gym and athletic-training slang. The underlying sense of 'work out' meaning to solve or resolve something through effort — as in working out a problem — extended naturally to the body: training a muscle or a plan until it's 'worked out' into shape. The noun form split off from that verb phrase, settling into its modern fitness sense.

word shift
Noun form only became common in 1960s fitness culture
boxing roots
Gyms once called any training session a workout
afterburn effect
Body keeps burning extra calories hours after
minimum dose
Even 7 minutes can trigger real fitness gains
the.com · every word