Mike Thurston: natty or not?
Uncertain British fitness YouTuber and WBFF competitor, THRST founder
Short answer. Verdict: uncertain. At the peak physique on this page, Mike Thurston is 6'0" (183 cm) and 205 lbs (93 kg) at roughly 10% body fat. That works out to an FFMI of 24.8, against the ~25 mark cited as the natural ceiling.
No official record settles this. What follows is opinion and analysis based on public numbers — how we judge.
The numbers (estimated)
| Peak physique | His late-2010s form, around 205 lbs lean |
|---|---|
| Height | 6'0" (183 cm) |
| Weight | 205 lbs (93 kg) |
| Body fat | ~10% |
| Started lifting | around age 18 |
| FFMI | 24.8 — ~25 is the cited natural ceiling |
Era by era (estimated)
| Era | Year | Age | Weight | Evidence | Body fat | FFMI |
|---|---|---|---|---|---|---|
| Eight years into training | 2016 | 26 | 205 lbs (93 kg) | reported | ~10% | 24.8 |
| Mid-30s form | 2024 | 34 | 201 lbs (91 kg) | reported | ~10% | 24.3 |
FFMI over time (estimated)
FFMI per era (values in the table above). Hover a point for details.
Note. Mike Thurston says he is natural and has offered to take “any test.” No record contradicts him. Every number below is a reported figure or our own photo read — the widely shared “scan” of him is a fan-run estimator, not a measurement.
Mike Thurston started lifting at 18, competed in the WBFF, and built one of YouTube fitness’s biggest brands on a physique that sits exactly on this site’s hardest line.
The math
His commonly reported stats — about 205 lbs (93 kg) at 6’0”, carried lean — compute at our 10% read to 185 lbs (83.7 kg) fat-free: FFMI 24.8. At the leaner numbers his fans circulate, it crosses 25. That’s the top-tier-natural band’s upper edge: reachable by a genetic outlier eight-plus years into serious training, and equally consistent with modest assistance. The timeline offers no tiebreaker — his documented transformation runs ages 18-26, the window where big cumulative gains are legal tender, and his 30s show maintenance, not new territory.
Context leans the way it always does for physique influencers: the WBFF stage he competed on publishes no meaningful testing regime, the physique is the product, and community opinion splits between “fake natty” and “epic genetics” — neither of which is evidence.
Verdict
Uncertain. The numbers straddle the ceiling inside estimate error, the growth all happened in the years where natural math permits it, and there is no admission, record, or verified figure on either side. The tripwire: meaningful new lean mass in his mid-30s would tip this to likely-enhanced; a verified DEXA at his claimed leanness would tip it the other way.
Common questions
Is Mike Thurston natty or on steroids?
This site rates Mike Thurston as uncertain. That is an opinion drawn from public numbers, not a statement of fact: the peak physique on this page works out to an FFMI of 24.8, against the ~25 mark cited as the natural ceiling.
Has Mike Thurston ever failed a drug test or admitted to using PEDs?
Nothing of the sort turned up in the sources on this page. Had it, the verdict would read confirmed instead of uncertain.
What is Mike Thurston's FFMI?
About 24.8. That comes from 6'0" (183 cm) and 205 lbs (93 kg) at roughly 10% body fat, normalized to 1.8 m. Drug-free lifters in the Kouri 1995 study topped out near 25.