Crossword Genius

Healthiest outings end in sweat (8)

Ross

I believe the answer is:

jolliest

I'm a little stuck... Click here to teach me more about this clue!

'healthiest' is the definition.
Both the answer and definition are superlative adjectives. Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for jolliest that I've seen is " Extremely merry".)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app