What Is the 10 Percent Test? The 10 Percent Test is a simple assessment that tells you whether your aerobic base is developed enough to benefit from high-intensity training. It compares two numbers: your Aerobic Threshold (AeT) heart rate and your Anaerobic Threshold (AnT) heart rate. The rule: If the spread between your AeT and … Continue reading When and How to Add High-Intensity Training: The 10 Percent Test