Your lifts are hormonal.

Normal testosterone is 300-1000 ng/dL (adult males), but for strength athletes, 'normal' isn't optimal. A lifter with testosterone 400 will progress slower than one with 650—both are technically 'normal.' The gap is performance, not pathology. More critically, only Total Testosterone is inadequate; you need Free Testosterone (unbound, biologically active) and SHBG (Sex Hormone-Binding Globulin), which determines how much T is available. A lifter with Total T of 500 but high SHBG might have low Free T and poor gains. Your physician assesses total, free, and SHBG together to determine whether your hormonal environment is anabolic.

Cortisol is the catabolic hormone—high levels directly oppose muscle protein synthesis. Under heavy training load, cortisol rises to mobilize energy; this is normal. The problem is when cortisol stays elevated, creating a catabolic state where you're breaking down muscle faster than building it. The cortisol:testosterone ratio predicts whether you're in anabolic or catabolic state more accurately than either alone. A lifter with cortisol 28 and testosterone 420 has a ratio of 0.067 (catabolic). One with cortisol 14 and testosterone 650 has a ratio of 0.022 (anabolic). High cortisol accelerates muscle loss, causes injury, and tanks motivation. Monitoring it lets your physician optimize training volume and deload timing.

Core markers for strength athletes: Total Testosterone + Free Testosterone (separate tests), SHBG (determines bioavailable T), Cortisol (overtraining signal), CPK (Creatine Phosphokinase—muscle damage marker), liver panel (ALT, AST, GGT, because high-protein diets stress liver), ferritin (heavy training depletes iron), complete lipid panel (cholesterol often crashes on high-protein diets), and inflammatory markers (hs-CRP). Most lifters benefit from baseline metabolic panel and kidney function. Testing quarterly or every 6 months tracks whether your training is sustainable and your supplements are protecting organ function.

High protein isn't inherently bad for liver, but heavy lifting + high protein stresses liver enzymes. About 40% of serious bodybuilders show mildly elevated ALT/AST without underlying disease—it's protein-induced enzyme elevation, not injury. However, it means your liver is working harder and inflammation is present. Elevated enzymes signal that dehydration, recovery, or protein quantity needs adjustment. Testing liver markers (ALT, AST, GGT) identifies this before it progresses. Most lifters with elevated markers reduce protein to 2.2g/kg (not 3+g/kg), increase hydration, and add liver support (NAC, milk thistle). Retest in 8 weeks. A physician can distinguish between benign elevation and actual hepatic stress.

Natural testosterone optimization has four pillars: sleep (7-9 hours; testosterone peaks in REM), heavy resistance training (compounds, 4-8 reps), micronutrient status (zinc, Vitamin D, magnesium—test baseline), and stress management (high cortisol tanks T). Supplements with evidence: zinc (if deficient), Vitamin D (if below 30), ashwagandha (cortisol reduction), tribulus (mild), and tongkat ali (modest). But test first. A lifter with testosterone 420 and Vitamin D 18 benefits more from D3 repletion than from exotic adaptogens. Your physician identifies which specific micronutrient is limiting and builds a protocol: sleep priority, training optimization, nutrient repletion, stress coaching. Most gain 80-120 ng/dL with strategic optimization.

CPK (Creatine Phosphokinase) is an enzyme released by muscle when it's damaged. Intense lifting elevates CPK—this is normal and expected. However, very high CPK (>800-1000) signals excessive muscle damage, inadequate recovery, or overtraining. It's a window into whether your training volume is sustainable. A lifter crushing it on program with CPK 200-400 is fine. One with CPK 1200+ is at risk of rhabdomyolysis, joint stress, or overuse injury. CPK trends also reveal recovery quality: if you deload properly and add sleep/nutrition, CPK should drop 40-50% in 2 weeks. Testing CPK every 6-8 weeks guides program modifications. Combined with cortisol and testosterone, it tells you exactly whether you're training smart or just hard.

Baseline (year 1): comprehensive screening—hormones (T, free T, SHBG, cortisol), liver (ALT, AST, GGT), kidney (creatinine, BUN), lipids, metabolic panel, CPK, Vitamin D, iron. This establishes your baseline and identifies pre-existing risks. During heavy training: retest every 6 months, or quarterly if you're cutting (protein intake often spikes, stressing liver). After deload weeks: CPK, cortisol, testosterone should shift; tracking these validates your recovery. If adapting program: liver panel every 6 months to ensure high protein isn't causing damage. Most competitive bodybuilders benefit from quarterly monitoring during contest prep. This data-driven approach identifies when to back off, when to push, and whether your supplements are actually helping.

arq tests the biomarkers that predict whether you're in an anabolic or catabolic state—not generic health metrics. Your physician understands strength physiology: testosterone alone is insufficient (you need free T and SHBG), cortisol:testosterone ratio predicts overtraining before you stall, liver stress from high protein is real and manageable, and CPK reveals whether recovery matches training volume. We track markers across your training cycle, identify when you're in catabolic state (high cortisol, low free T, high CPK), and adjust protocol: deload timing, sleep optimization, protein reduction, supplement targeting. Most strength athletes discover they're overtrained or micronutrient-deficient—fixing it unlocks 15-30% strength gains that programming alone can't achieve. You get a physician accountable to your 1RM, not a generic recommendation.