The evidence-based fitness community has long positioned itself as the antidote to bro science, championing peer-reviewed research over anecdotal claims. But according to veteran researcher Lyle McDonald, the movement has become exactly what it once opposed—a circle of gatekeepers protecting their own interests while producing questionable science.
McDonald’s falling out with the evidence-based circle began in 2019 when he publicly criticized a volume training study by Brad Schoenfeld, widely promoted as “the world’s preeminent expert in muscle hypertrophy” by figures like Mike Israetel.
The study claimed to show a dose-response relationship between training volume and muscle growth, with participants performing up to 45 sets per muscle group weekly, all supposedly taken to momentary concentric failure.
McDonald’s critique was multifaceted. First, he questioned whether the prescribed workouts were even physically possible. “Show me the workout. Send me a video. Prove this to me,” McDonald challenged, eventually offering $1,000 to anyone who could complete the protocol as written.
Six years later, no one has claimed the prize. The prospect of performing five sets of squats to true concentric failure—where you literally cannot complete the rep and get stuck at the bottom—with only 90 seconds rest between sets, three times weekly for eight weeks, stretches credibility to its breaking point.
Beyond the implausible training protocols, McDonald identified serious methodological flaws. The study’s statistical analysis failed to support its own conclusions about a dose-response relationship. Neither the standard p-values nor the Bayesian analysis showed meaningful differences between groups, yet the authors concluded otherwise.
Perhaps most critically, the ultrasound measurements used to assess muscle growth were not blinded—the assessor knew which participants were in which group, creating enormous potential for bias.
The response to McDonald’s critique revealed the true nature of the evidence-based community. Rather than addressing his concerns, Schoenfeld blocked him. Other prominent figures followed suit, effectively blacklisting McDonald from the inner circle he once belonged to.
Eric Helms, Brett Contreras, Alan Aragon, and Jeff Nippard—all of whom had previously collaborated with McDonald—cut ties.
“Brad is above criticism in all their eyes because he controls their research and their financial future,” McDonald explained. “They had to defend him because he is the head, the ostensible head of the evidence-based fitness group.”
This incident exemplifies broader problems plaguing exercise science. McDonald’s mentor, a materials engineer, had opined early in McDonald’s career that exercise science was “a joke,” based on small sample sizes, zero replication, and impossibly poor levels of control. Decades later, McDonald has reluctantly concluded his mentor was largely correct.
The field suffers from fundamental limitations. Researchers cannot blind subjects to training interventions—participants obviously know whether they’re doing one set or five. The assessment methods, particularly ultrasound measurements, are highly susceptible to bias when assessors aren’t blinded.
Studies typically involve 10-12 subjects per group, far too few given the enormous individual variation in training response. And unlike pharmaceutical research with thousands of participants, exercise studies recruit from small pools of college students who may not control their diets or truly qualify as “trained” despite years of gym attendance.
Perhaps most damaging is the lack of replication. “Science is based on replication because one paper doesn’t mean anything,” McDonald noted. Yet resistance training studies vary wildly in their protocols—different exercises, set and rep schemes, rest intervals, and definitions of failure—making meaningful comparisons nearly impossible.
The Mike Israetel saga further illustrated the evidence-based community’s credibility crisis. McDonald appeared on Solomon Nelson’s channel, which later exposed serious problems with Israetel’s doctoral thesis.
Israetel, who had once praised McDonald as “brilliant” and called him “a friend” and “a mentor,” responded to criticism by calling McDonald “one of the most bad faith actors in all of fitness” who is “insane, cruel, mean, psychotic, and has zero accomplishments.”
The evidence-based circle rallied around Israetel—until they couldn’t. As public scrutiny intensified, the community’s attempts to defend the indefensible became increasingly transparent. “They didn’t realize that the ground has shifted,” McDonald observed, noting that the internet’s reach has made it impossible to simply block critics and move on.
At 55, McDonald continues training three days per week using brief, intense machine-based workouts and maintains his condition through alternate-day fasting. He’s long since abandoned the pretense of being part of any fitness community, instead focusing on providing information he believes actually helps people—the goal that drew him to the field four decades ago.
The irony is profound: a movement that positioned itself against pseudoscience has become an insular network protecting its own, producing questionable research, and attacking critics rather than addressing criticisms.
