Do it for other people.
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Of course, that new fitness regimen will help cure your ailments and ensure you live a longer life, but it also makes you better company. As my friend, fitness guru Don Wildman, says, "It just takes the piss and vinegar out of you." If I don't train in the morning, I'm just not as good a person. And I'm not as good a person to the people I love – my family, my woman, my friends. And my tolerance for stress is a lot lower.