Athletic

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mid 17th century: from French athlétique or Latin athleticus, from Greek athlētikos, from athlētēs (see athlete).

wiktionary

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From French athlétique and Latin āthlēticus, from Ancient Greek ἀθλητικός(athlētikós, “relating to an athlete”), from ἀθλητής(athlētḗs, “athlete”): equivalent to athlete +‎ -ic. For more, see athlete.

etymonline

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athletic (adj.)

1630s (athletical is from 1590s), "pertaining to an athlete or to contests of physical strength," from Latin athleticus, from Greek athletikos, from athletes "contestant in the games" (see athlete). Meaning "strong of body; vigorous; lusty; robust" [Johnson, who spells it athletick] is from 1650s.