Hemoglobin is the protein inside red blood cells that carries oxygen from your lungs to working muscle. Steady levels support aerobic capacity, while a drop can make the same training load feel harder.

High-sensitivity CRP is a general marker of low-grade inflammation anywhere in the body. Temporary rises are common after hard blocks or illness, and a persistently raised value is a cue to look at load, sleep and recovery habits.

Vitamin D is measured as the circulating storage form your body makes from sunlight or gets from food. It plays a role in bone strength, muscle function and immune resilience, which matters most through low-light months.

Red-cell magnesium estimates the magnesium held inside cells rather than the short-lived amount in serum. Magnesium supports muscle relaxation, nerve signalling and energy production, so it is often looked at alongside sleep and cramping patterns.

Vitamin B12 supports red blood cell formation and healthy nerve function. Sustained low levels can show up as fatigue or reduced training tolerance, particularly on plant-forward diets.

TSH is the pituitary signal that tells your thyroid how much hormone to produce, so it is used as an early read on thyroid balance. Because thyroid output influences metabolic rate, it is often reviewed when energy or body-composition trends shift.

Morning cortisol captures the natural early-day peak of your main stress hormone, which helps mobilise energy and wake you up. Reading it against sleep and strain trends gives context on how well your stress load is being absorbed.

Total testosterone measures the circulating amount of a hormone involved in muscle repair, drive and bone health in all bodies. It moves with sleep, energy availability and training load, so trends matter more than one value.

ApoB counts the cholesterol-carrying particles most closely associated with long-term cardiovascular risk. Tracking it over time gives a clearer picture than cholesterol totals alone.

HbA1c estimates your average blood glucose over roughly the past three months by measuring sugar bound to red blood cells. It gives a slow-moving view of metabolic health and fuelling patterns.

Triglycerides are fats circulating in the blood, strongly influenced by recent meals, alcohol and carbohydrate intake. Lower, stable values generally accompany good metabolic flexibility.

Creatine kinase leaks out of muscle after mechanical stress, so it acts as a rough gauge of muscle damage and repair status. Spikes are expected after heavy or novel sessions and should settle within a few days.

Albumin is the most abundant protein in blood and reflects protein availability, hydration and general nutritional status. Stable levels support fluid balance and tissue repair between sessions.