**KEY SESSION** - Training ability Primary - Aerobic endurance Goal/Target of session - improve your body's ability to utilise fat for fuel at higher intensities - This workout is designed to improve your body's ability to utilize fat for fuel at higher intensities. The core of the session involves maintaining a steady, high Zone 2 effort (your Fatmax zone) and punctuating it with short, sharp efforts. This combination helps to stress your metabolic system and encourage adaptations that increase fat oxidation.