The NXT RUN Blog

Training science, runner to runner

Coaching that adapts to you, backed by real sports science. Notes on training, racing, and getting to the next level.

A runner holding a strong, controlled tempo effort on a track at sunset
Training Science

The Tempo Sweet Spot: A Runner's Guide to Threshold Training

The tempo run is the workhorse of every half and marathon build. Here is what threshold training actually does, how to find your tempo pace, and how to structure the workout.

NXT RUN Coaching Team·June 29, 2026·6 min read
 A runner logging easy aerobic miles on a trail at sunrise
Training Science

Slow Down to Get Faster: A Runner's Guide to Easy Pace

Most runners run their easy days too hard. Here is what easy runs actually build, how to find your true easy pace, and why holding back is the engine behind every PR.

NXT RUN Coaching Team·June 16, 2026·6 min read
 A runner checking the data on his GPS watch on a forest trail
Training Science

The Run Impact Score & Fitness Trend Chart, Explained

Did that workout actually do anything? Here is how NXT RUN scores every run for Endurance, Strength, and Speed, and how the Fitness Trend Chart shows where your training is really heading.

NXT RUN Coaching Team·May 21, 2026·7 min read

More articles coming soon. Lace up.

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