Three brothers share a family sport

Three brothers share a family sport:
A non-stop marathon
The oldest one is fat and short,
And trudges slowly on.
The middle brother's tall and slim,
And keeps a steady pace.
The youngest runs just like the wind,
Speeding through the race.
"He's young in years, we let him run,"
The other brothers say
"'Cause though he's surely number one,
He's second, in a way."
How and who are the three Brothers

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The hands on a clock (hour, minute, and second).