Crossword Genius

Exercise time, then shower? (5)

Ross

I believe the answer is:

train

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But I can't explain it at all! Could you help me understand?

(Other definitions for train that I've seen before include "Retinue; sequence" , "Line of carriages with a locomotive" , "Trailing material on dress" , "Locomotive and coaches" , "Trailing part of bridal dress" .)

I've seen this clue in The Telegraph.
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