“Just wanted to let you know how things are going with my running. I took your advice and have been running at a conversational pace for the past 2 weeks. To my surprise the faster I went the better it felt and I was in complete disbelief. It felt so amazingly effortless. I was able to go significantly faster with much less work output. I feel this could be a turning point in my training and that I am reaping the benefits of high altitude training. Thanks, Rosa”