Since January, we've been tracking the training of Dr. Sanjay Gupta and six iReporters as they prep for the August 7 Nautica New York City Triathlon.  Starting today, we're adding expert advice from our friends at Triathlete.com

Most triathletes take their training seriously. They are highly motivated, disciplined and willing to work hard to improve.

However, I also see most triathletes making the same training mistakes over and over again. I’m not talking about small mistakes in the details of training, but fundamental ones that impede progress in a major way. I’d like to talk about five such mistakes and show you how to avoid each of them.
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