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External Load vs. Internal Response

External Load vs. Internal Response

Load, stress, strain—they’re terms we hear a lot in sports science, but what do they mean? Dr. Stephen Seiler explores how your internal response to external load will change as you become fitter and more durable.

The Science Behind Going Slow to Be Fast

The concepts of central and peripheral conditioning help explain why an effective training base period leads to speed and durability in the race season.

Polarized training guide

Polarize Your Training Stress

Dr. Stephen Seiler explains why polarized training is a winning strategy for the long game of endurance sports. By balancing the stress of training, athletes see bigger gains over time.

Polarized Training 3 zone model with lactate thresholds

The Science Behind Polarized Training 

Polarized training is a case where science hustled to catch up with real-world results. Coach Trevor Connor explains how sport science misunderstood the physiology and inadvertently shifted the focus toward high-intensity training.

exercise intensity distribution in the Polarized Training Method

How to Measure Intensity Distribution

Is 80/20 really the best mix of intensities? And what’s the best way to categorize training? Dr. Seiler has a simple method to get you started.

3 workouts to polarize your training

Three Rides to Polarize Your Training

To truly polarize your training, you need to focus your training in two key zones. Coach Trevor Connor explains how this works for the sport of cycling, but the physiology applies to all endurance sports.

overreaching polarized training

How Polarized Training Can Save You From Overreaching

It can be very easy to train at a moderate intensity all the time, which can be a surefire way to land in an overreached state. Polarized training can help prevent that—and in this video, Dr. Seiler explains how.