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 checking a GPS watch during a summer long run

Fuel the Long Run, Finish Strong: A Marathoner's Guide to Long-Run Nutrition

Past two hours, your body runs low on its favorite fuel. When to take your first gel, how many carbs per hour, how to train your gut, and how to hydrate in the heat without hitting the wall.

A runner holding a strong, controlled pace on a long open road

Teach Your Long Runs Race Pace: A Guide to Marathon-Pace Segments

Easy miles build the engine. Miles at goal pace teach your body to hold it on tired legs. When to start race-pace segments, how much is enough, and how to keep them from wrecking recovery.

A runner striding fast and relaxed on a track at golden hour

Free Speed Hiding in Your Easy Runs: A Runner's Guide to Strides

Twenty seconds of fast, relaxed running a few times a week is the cheapest speed you will ever buy. What strides actually do, how to run them right, and why base season is stride season.

A runner logging steady summer miles on an open road with mountains behind

Your Fall Race Is Built Now: A Runner's Guide to Base Building

October is made in July. How much mileage to add each week, when to hold steady, and the down weeks that get you to your fall start line strong and healthy.

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

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.

A runner logging easy aerobic miles on a trail at sunrise

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.

A runner checking the data on his GPS watch on a forest trail

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.

More articles coming soon. Lace up.

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