healthy, correct
佶 centers on being in proper condition: healthy and correct. The two meanings connect through the idea of something being sound and as it should be.
佶 combines 亻 (person) with 吉, which likely contributes the sound and carries a sense of good fortune or correctness, suggesting a person in a sound state.
A person 亻 beside 吉 (good luck) is a person in good health and correct condition. Picture someone standing straight and healthy, blessed with good fortune.
For キツ, imagine a healthy person doing kits (exercises) to stay correct and fit: kits -> キツ, and the person stays in top shape.
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