I and my friend agreed to a 90-day challenge. We had to run 21km race and he has a 30-minute advantage. Meaning, if he finishes in 2hours, then for me to win I have to complete the race in 1hour 30 minutes.
And just to raise the stakes a little bit, the loser pays the winner 70 euros.
Turned out it wasn't money that was motivating us...
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