Rivalry

 Jack and Bill are both outstanding cyclists and are
being trained by a famous coach who hopes that one
day they can become members of the national team.

Although they both regard each other as their strongest rival,
Jack has never beaten Bill in training, because Bill has better
stamina, he always overtakes Jack in the final sprint near the
finish line. This makes Jack feel a little frustrated and discouraged.

Today's weather is extremely hot. During training, Jack almost suffers
heatstroke, so he chooses to travel light, not caring that this will expose
his secret. In this training session, he beats Bill for the first time.