VO2max - the size of your aerobic engine; how much oxygen your body can consume and convert into power. A higher VO2max means a larger aerobic ceiling.

VLamax -  your glycolytic rate is how quickly your body produces lactate at high intensities. This single metric explains why two riders with identical FTPs can perform so differently.

A high VLamax gives you explosive sprint power and strong short efforts, but leads to faster fatigue on sustained climbs and time trials - your anaerobic system burns through carbohydrates too quickly to sustain long efforts efficiently.

A low VLamax means strong aerobic endurance and better fatigue resistance over longer efforts — but a flatter sprint. Neither is right or wrong. Understanding yours tells us exactly where to focus training.

Critical Power - A more precise measure of your sustainable power threshold than FTP - calculated directly from your test efforts rather than estimated from a 20-minute test.

Carbohydrate Combustion Rate - at every level of intensity, INSCYD calculates exactly how many grams of carbohydrate your body burns per hour. This means your fuelling strategy for training sessions, long rides and race day is built around what your body actually does, not a generic guideline.

A rider burning 90g of carbohydrate per hour at threshold needs a very different fuelling plan to one burning 60g. Getting this wrong leads to bonking, poor pacing and inconsistent performance. Getting it right is one of the biggest marginal gains available to amateur cyclists.

FatMax The power output at which your body burns the maximum amount of fat per minute. Particularly useful for endurance riders, sportive riders and anyone whose events last more than two hours - knowing this intensity helps you pace smarter and fuel more efficiently.