the.com/weakling

The gym's favorite insult, invented by people who skip leg day too.

means A person who is physically weak or lacking in strength, vigor, or resolve.

from Simple carpentry: take the adjective 'weak' (from Old Norse 'veikr,' meaning pliant or soft, related to the verb 'to bend') and bolt on the suffix '-ling,' which marks a diminutive — something small or lesser, as in 'duckling' or 'underling.' So a weakling is literally 'a small, lesser instance of weak,' built the same way English has been manufacturing belittling nouns for centuries.

origin
weak plus diminutive suffix ling, like duckling but sadder
first recorded
16th century, Shakespeare era insult of choice
irony
often hurled by people incapable of a pushup
usage shift
now mostly used sarcastically among friends lifting weights
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