Run with Cip

Real training, real races, real mistakes, documented so other runners can learn from them too.

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My latest blog posts

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Are These Three Things Limiting Your Running Performance?
Are These Three Things Limiting Your Running Performance?

I used to think getting faster was just about training harder. Turns out performance is capped by three separate systems: cardiovascular, muscular, and the mind, and figuring out which one is holding you back changes everything about how you train.

How I Ran Two Majors, Two Weeks Apart, and Did A Personal Best on Both
How I Ran Two Majors, Two Weeks Apart, and Did A Personal Best on Both

I flew from Berlin to Chicago two weeks after running my first sub-three-hour marathon, slept three or four hours a night, forgot my nipple tape, and still ran another PB. Here's how the Chicago Marathon went, from the starting corrals to the finish line topless.

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Know Your Numbers

From race day predictions to hill efforts and hot weather runs, these free calculators help you train and race with the right numbers in hand.

Race Pace Calculator

Stopwatch icon representing the running pace calculator.

Race Pace Percentage Calculator

Percentage symbol icon representing the race pace percentage calculator.

Heat and HumidityCalculator

Sun and water droplet icon representing the heat and humidity pace adjustment calculator.
Rising line graph icon representing the grade-adjusted pace (GAP) calculator.

GAP Pace Calculator

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