Menno.Henselmans

Menno Henselmans is Dutch, originally from the Netherlands, which is reflected in his distinctly Netherlandish name. He works internationally and is listed as US-based, but his academic and fitness career has roots in European sports science culture. Much of his work is conducted online, giving his reach a genuinely global footprint.

Before pivoting to exercise science full-time, Menno Henselmans worked as a business consultant. He left the corporate world to pursue evidence-based training science, and his analytical, data-driven approach to fitness clearly reflects that background. This career switch is a well-known part of his story in online fitness communities.

Bayesian Bodybuilding is Menno Henselmans' original brand and website, where he has published evidence-based training and nutrition articles since the early 2010s. The name reflects a probabilistic, research-first approach to evaluating fitness science — weighing cumulative evidence rather than following dogma. His YouTube and Instagram content carry the same philosophy forward under his own name.

Menno Henselmans has publicly stated he is a natural athlete and does not use performance-enhancing drugs. He is frequently referenced in natural bodybuilding communities as a credible example of evidence-based physique development without pharmaceutical assistance. His coverage of steroid-related topics, such as MRI studies on steroid gut, comes from an educator's perspective rather than a user's.

The Henselmans Personal Trainer Certification — often called the Henselmans PT Course — is an online program Menno designed for coaches who want a rigorous, science-based education in training and nutrition. It goes considerably deeper into exercise science than most mainstream PT certifications, covering hypertrophy, programming, and nutrition research in serious detail. Enrollment opens periodically, and Menno promotes it directly through both his YouTube and Instagram channels.

Menno Henselmans argues that Mike Mentzer's core principles around high-intensity, lower-volume training are more scientifically defensible than the mainstream fitness world acknowledges — and that most critics misrepresent what Mentzer actually advocated. His take is evidence-first: he examines what current research on training volume, intensity, and frequency actually supports rather than dismissing Mentzer on cultural grounds. It is a characteristically analytical approach to a debate that usually generates more heat than light.

Menno Henselmans covered emerging research that significantly complicates the long-length training trend — the idea, popularized in the early 2020s, that training muscles at their most stretched position produces superior hypertrophy. Newer studies appear to challenge the strength of that claim, and he presented the new data as a meaningful update to the evidence base. His position is consistent with his broader brand: recommendations should follow the research, even when that means revising something the fitness community had widely accepted.

Steroid gut is the severe abdominal distension seen in some professional bodybuilders who abuse growth hormone and insulin, and Menno Henselmans highlighted MRI research showing it involves actual enlargement of internal organs — not water retention or digestive bloat. The imaging evidence distinguishes it structurally from temporary bloating, making it a more serious and largely permanent condition. Menno covered it as part of his broader pattern of applying hard scientific data to widely misunderstood bodybuilding phenomena.

Menno Henselmans is active on both YouTube and Instagram, with Instagram carrying a larger follower base and more frequent posts. His YouTube channel is home to longer, more in-depth educational videos on training science, hypertrophy, and nutrition research. Both platforms are focused entirely on evidence-based content aimed at serious trainees and fitness professionals.

Menno Henselmans' audience is overwhelmingly male — roughly three in four followers — and concentrated in the 18-to-34 age range, suggesting his content resonates most with younger men who train seriously and want the science behind their programming. His largest audience is in the United States, followed by the United Kingdom. The depth of his material attracts both dedicated gym-goers and working personal trainers looking to sharpen their evidence-based knowledge.