Two men, separated by half a century, who each fundamentally changed how Americans think about exercise. One built an empire that still carries his name. The other pioneered a methodology that’s still argued about in gyms worldwide. Comparing them reveals a lot about what fitness culture values — and what it gets wrong.
Jack LaLanne: The Original
Jack LaLanne opened what is widely considered the first modern health club in Oakland in 1936. At a time when exercise was widely considered dangerous for adults — when doctors advised against it — he spent decades making the case that strength training and cardiovascular fitness were foundational to human health.
He was right about almost everything important. Weight training improves longevity. Nutrition matters as much as exercise. Functional fitness — being capable of real-world physical tasks — should be the goal. He preached these ideas for sixty years before they became mainstream.
His personal practices were extraordinary and well-documented. His 70th birthday swim — handcuffed, shackled, and towing 70 boats — is one of the more remarkable human performance demonstrations in fitness history. He remained visibly lean and strong into his nineties.
Greg Glassman: The Disruptor
Glassman built CrossFit from a single gym in Santa Cruz into a global franchise by doing several things right: he created a methodology with clear first principles, he made competition a central feature, and he built a community that conventional gyms couldn’t replicate.
The “constantly varied, functional movement, high intensity” model has genuine merit. Variance prevents the adaptation stagnation that kills long-term progress. Functional movements build transferable capacity. High intensity, used intelligently, is a powerful training stimulus.
The criticism — injury rates, programming that doesn’t always scale safely for beginners, the cult-of-intensity culture in some boxes — is also legitimate. CrossFit at its best is excellent. CrossFit implemented poorly produces injured people who blame themselves.
Where They Agree
More than their surface differences suggest. Both built their philosophies around the idea that ordinary people are capable of extraordinary things if they train seriously and consistently. Both rejected the low-intensity, machine-focused, appearance-obsessed fitness culture of their respective eras. Both built communities as much as they built bodies.
LaLanne would have been comfortable with the functional movement emphasis. Glassman would recognize the nutrition philosophy. The fundamental belief — that fitness is a serious pursuit with profound health consequences, not a vanity project — is shared.
The difference is mostly one of era and implementation. LaLanne built a personal brand. Glassman built a system. Both moved fitness culture forward. Both also left behind some baggage worth leaving behind.