William Horkoff

In the last few years, double threshold days have become a major talking point in endurance sport especially after the rise of Norwegian athletes dominating triathlon and middle-distance running. Two sessions in one day, both at controlled medium-to-high intensity (usually around 2.0 to 3.5 mmol/L lactate). The idea is simple: by splitting the same work into two manageable sessions, athletes can accumulate more high-quality intensity across a week without destroying themselves in a single...

Every now and then a study drops that makes people rethink what they think they know about training. I came across this one about a week ago and found it super interesting This one’s a perfect example. A massive “big data” study looked at 120,000 runners and 150,000 marathons using STRAVA data. Basically, they analyzed what people were actually doing in training leading into their races not what they said they were doing. The results? They found that faster marathoners don’t train at...

Personalizing race fueling without a lab (and without wrecking your gut) The gold standard to find your peak exogenous glucose oxidation...