Well, attempted my first training at high Colorado, near Nederland north of Boulder, CO. Tamara was on the bike for support as I ran. The first 3 miles.. I labored my breathing. My heart rate was about 165 at a 10 min mile pace. While my normal is about 8:30 at about 130. It took me about 3 miles for my lungs to acclimate. My head was pounding and my breathing was labored. I had to stop about 6 times in the first 3 miles. After that, I started to feel better and start cruising faster.
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