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Boasting about one's physical training (30 abs, 45' run, whatever), trying to make everyone jealous of this motivation.

Generally, this training is so exceptionnal that people need to sport-brag in order to increase the impact of this training.
Typical Sport-Bragging :

"Yesterday, I ran 10 km. I feel so good right now", Leslie sport-bragged Leslie. "Not like you, looser", she thought.
by Galaxy123 October 18, 2010
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