The Kelly criterion [https://en.wikipedia.org/wiki/Kelly_criterion] calculates the best size bet in a game of chance. A key principle of the criterion is that over-betting will lead to ruin. Under-betting only slows the growth rate. When selecting training loads, “over-betting” will always lead to over-training. “Under-betting”

Over the past week, I’ve run two four-minute time trials. I botched the first one by starting way too fast. The splits of the second trial were much more consistent. To get reliable results, I recommend the following: * Use an 8x 30-second format; * Set interval alarms for each 30″

The power went out at 4am this morning. My brain is still on Mallorca [https://goo.gl/maps/Cr39NcHsUiy] time, so I was already awake, laying and staring in the dark, when the face of my alarm clock went black. I went downstairs, suited up, and pulled on my running

I think it was Wolfgang Gullich [https://en.wikipedia.org/wiki/Wolfgang_G%C3%BCllich] who said, “The hardest part of training is starting.” He was close, but not completely correct. It’s true that starting to train is hard. It’s easy to procrastinate. But even worse is starting

I loved the idea of an app that could tell me to train or not to train, to go easy or go hard. Not having to make that decision was a relief. However, the current crop of HRV apps are more hazard than help. After using them for a couple

On October 24th, 2016, I hired a coach. I had previously made so many mistakes that I was left with a declining work capacity and worries that I may never train again. Months later, my coach told me, “I was surprised at how fragile you were.”

It’s been known for a long time that training at one’s anaerobic threshold is not a magic bullet. Then why is it still so popular?

No, but bullshit is.

It’s almost 4am and I’m crying in a rocking chair, trying to get my 2-month-old boy to go to sleep. Yesterday, Guy Lacelle died in an avalanche in Hyalite Canyon. For some reason it’s sadder when I hold a baby. Most people know that Guy was a

> My mother said to me, ‘If you are a soldier, you will become a general. If you are a monk, you will become the Pope.’ Instead, I was a painter, and became Picasso. A friend and training mentor once told me, “The secret of the pros is that they train