Greg Glassman built CrossFit out of polio recovery, gymnastics, and Santa Cruz personal training sessions. By the mid-2000s, his company operated 15,000 gyms in 160 countries. Calum Marsh's The Glass Box tells the story of how a fitness regime designed for seniors and the overweight became the physical vocabulary of American militarism and, eventually, the Trump-era masculinity project. The timing was structural, not accidental. CrossFit launched its website just before 9/11 and made it accessible to deployed military personnel. The company named workouts after fallen service members and plastered its site with soldiers doing pull-ups on tanks. The aesthetic — no mirrors, no vanity, rough garage-style — mapped perfectly onto the post-9/11 demand for a hardened, battle-ready identity. Marsh calls it a "more self-determined and hardened, battle-ready stance," and CrossFit met the moment with programming that promised bleeding and vomiting rather than the painless efficiency of Jane Fonda or the ThighMaster. The book traces a clean arc from 1980s boutique fitness clubs with soft jazz, through the 90s infomercial era, to CrossFit's deliberate inversion: "You're gonna have to try. It's going to be brutal." That inversion — suffering as virtue, difficulty as selling point — is the connective tissue between a Santa Cruz gym and Pete Hegseth making physical fitness a military command priority. The line from CrossFit's ethos to Hegseth and RFK Jr.'s "Pete and Bobby Challenge" is direct enough that Marsh doesn't need to draw it; the reader can see it. Glassman himself is the book's engine: a polio survivor turned guru, charming and irascible in equal measure, who told his wife he'd be having more sex "either with or without you" and responded to accusations of systemic sexual harassment by claiming critics were trying to "devalue the company and buy it for scraps." His downfall arrived in 2020 when he tweeted "It's FLOYD-19" and said on a Zoom call, "I do not mourn George Floyd." He resigned, sold CrossFit, and collected $200 million. Marsh, a former CrossFit devotee who met his wife at a class, gives the movement its due as a genuine social innovation. The community-oriented classes created relationships that headphone-wearing gym culture never could. That social dimension — not just the burpees — is what made CrossFit sticky and what made its cultural influence durable even after Glassman's exit. The article lands at an interesting moment: Schwarzenegger and Stallone, whose physiques once defined a different era of body-as-spectacle, have re-emerged as avuncular cultural figures. Stallone's autobiography hit No. 1; Schwarzenegger is now cast as a voice of Republican reason. The body mirrors the culture, Marsh argues, and vice versa — it both responds to political changes and helps shape them. The question of whether Trump admiring Senator Husted's backside would have happened without CrossFit is unanswerable, but the book makes a convincing case that the aesthetic grammar was already in place. The Glass Box arrives as a cultural history that treats fitness seriously as politics — not as metaphor, but as infrastructure. The garage gym wasn't just where bodies were built; it was where an identity was forged that would outlast its founder's spectacular self-destruction.
