Your whole season, read in your biology.

Purines, the tryptophan pathway and melatonin shift over the night. With your overnight HRV and your sleep, they show how your nights follow your training weeks.

Oxylipins form from omega-6 and omega-3 fatty acids in the hours after a hard effort. Your soreness, resting heart rate and recent training load are read with them.

Glutathione shifts from its reduced to its oxidized form when exercise produces free radicals. Allantoin, uric acid and vitamin C follow the same balance, set against your load and your sleep.

When muscles burn a lot of fat, acylcarnitines from C2 to C12 rise in the blood. With 3-methylhistidine, your perceived effort and your sleep, they trace a heavy week.

Citrate, succinate and malate are steps of the Krebs cycle, the chain that supplies aerobic energy. Your VO2 max, morning HRV and resting heart rate are read with them.

Creatine restores energy for short efforts, and AMP breaks down into inosine then hypoxanthine after a sprint. Your vertical jump and perceived effort show how your legs respond.

Taurine and glycerophosphocholine help cells hold on to their water. Your scale, your sweat rate and your weigh-ins before and after a session complete the picture.

Tyrosine and phenylalanine are used to make dopamine and adrenaline, tryptophan to make serotonin. Your sleep and reaction time join them to read your demanding days.

Endurance training teaches muscle to move more fatty acids into the mitochondria, which acylcarnitines from C6 to C20 reflect. Your VO2 max and power are followed alongside.

Carnitine, nicotinamide and vitamin B5 are parts of the mitochondrial machinery, alongside Krebs-cycle intermediates. Your training load and VO2 max show the work that draws on them.

Leucine and the other essential amino acids switch on muscle building, and creatine fuels explosive efforts. Your muscle mass and peak power show what your strength blocks deliver.

Heavy weeks push tryptophan toward kynurenine and raise purines. The ratio of your acute to chronic load, your HRV and your sleep are read alongside.

3-Methylhistidine is released as muscle fibers renew after a demanding effort. Creatine, glutamine, your soreness and your sleep complete the picture.

Muscle is built and broken down every day. Essential amino acids show the supply, 3-methylhistidine the breakdown, and your food log shows how much protein you eat.

Creatinine comes from muscle creatine, in proportion to muscle mass. Followed with the muscle and fat mass from your scale, it shows whether lean mass holds from one sample to the next.

Repeated sprints draw on creatine and on nucleotides such as AMP and ADP. Your power across repetitions and the carbohydrates in your food log belong to the same reading.

During a taper, load comes down. Purines, short-chain acylcarnitines and the tryptophan pathway are read with your last 14 days of load, your HRV and your sleep.

Glucose, fructose and 3-hydroxybutyrate show which fuel is circulating at the time of sampling. Your continuous glucose readings, if you wear a monitor, and your meals over the past 48 hours add to them.

Melatonin and cortisol follow the internal clock, which shifts when you cross time zones. Your flights, sleep hours and skin temperature let you follow how it resets.

Cortisol, adrenaline and normetanephrine are part of the stress response, and tyrosine is their raw material. Your HRV and resting heart rate on high-stakes days are read with them.

Kynurenine, oxylipins, purines and cortisol keep a trace of past blocks. Your cumulative load, your steps and your sleep debt give the scale of the season.

Prolylhydroxyproline is a fragment of collagen, the protein of tendons and ligaments, and vitamin C is needed to make that collagen. Your injury history and training load are read with them.

Bone needs vitamin D, vitamin K, sex hormones and enough energy to renew itself. The bone mass from your scale, your steps and your running load complete the reading.

Estradiol and progesterone change from one cycle phase to the next, and many other readings change with them. The phase logged in your app, your temperature and your HRV place each sample within the cycle.

When intake falls short of expenditure, the body burns more fat, makes ketone bodies, and estradiol can drop. Your calories burned, your food log and your cycle regularity are followed together.

Recovery does not read the same in the follicular and the luteal phase. Estradiol, progesterone, the tryptophan pathway and purines are followed with your sleep, HRV and perceived effort across several cycles.

Glucose, fructose and glycolysis intermediates such as phosphoenolpyruvate show how carbohydrates are being used. They are read with your blood glucose, your high-intensity power and your meals.

Fatty acids enter the mitochondria as acylcarnitines, and the liver turns some of them into ketone bodies. Your VO2 max, body fat and long endurance sessions frame the reading.

Niacin, vitamin B5, vitamins C, D and K, and methylmalonic acid, linked to vitamin B12, tell you about your vitamin intake. Your meal photos and training load help connect them to what you eat.

Caffeine and its metabolites, led by paraxanthine and theophylline, show what is left of your coffee at the time of sampling. The time you took it and your sleep tell the rest.