The reason swimming is one of the hardest sports is because you have to be in the pool by yourself every day, making that sacrifice. There's no time to do anything else.
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I retired when I was 30, with all my marbles and a few bucks. But a lot of guys leave boxing penniless with no skills. Men in their 30s and early 40s, old for boxing, young in life, but also old in the job market if you're just getting started with no education. These guys need someone in their corner.