4,000 meters or yards in this swimming workout, with a mix of long and short swims to help you develop your base endurance fitness. Not just long, easy swimming!
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From Mat Luebbers, About.com GuideNovember 28, 2012
4,000 meters or yards in this swimming workout, with a mix of long and short swims to help you develop your base endurance fitness. Not just long, easy swimming!
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