"Just do it" doesn't work, running isn't bad for knees & more exercise myths | Professor Lieberman

TL;DR

Running is not inherently bad for healthy knees, but safe participation requires proper technique and gradual adaptation. Professor Lieberman says studies show running does not cause arthritis and may strengthen knee cartilage, although it can exacerbate existing arthritis. He also argues that exercise is easier to sustain when it is necessary, social, fun, and rewarding, not reduced to “just do it.” Read on for his guidance on injuries, aging, and lasting motivation.

Transcript

so walking is fundamental but i've argued in my in my research that running is also really fundamental and an important part of physical activity and that we evolved to run millions of years ago in order to hunt but yet a lot of people are very worried about running and they're wary of running because it's because there's this kind of general kind ... Read More

Key Insights

• 🏃 Running is a fundamental part of physical activity, and humans evolved to run millions of years ago.
• 🧎 There are misconceptions that running is bad for the knees, but studies show that it does not cause arthritis and may even help prevent it.
• 🏃 Proper running form and gradual adaptation to running are essential for injury prevention.
• 🧑‍⚕️ Physical activity is crucial for healthy aging and activates repair and maintenance mechanisms that slow down aging and improve overall health.
• 🏃 Exercise should be treated as necessary, social, and fun to encourage participation and long-term commitment.
• 🏃 There is no optimal dose or type of exercise, but some exercise is always better than none.
• 🧑‍⚕️ Intermittent fasting and physical activity share similar health benefits and mechanisms.

Questions & Answers

Q: Is running bad for your knees?

Running does not cause arthritis, according to the studies Professor Lieberman describes, and growing evidence suggests it may help prevent arthritis by strengthening knee cartilage. However, running can exacerbate arthritis once someone already has it.

Q: Why can running cause injuries even if it does not cause arthritis?

Every form of exercise carries some injury risk, and the knee is the most common site of injury. Running places greater stresses on the body than walking, so injuries can occur when technique or physical adaptation is inadequate.

Q: Why should running be treated as a skill?

Professor Lieberman says running must be learned properly, much like swimming, climbing a tree, or playing tennis. Poor habits such as overstriding and leaning add stress to the body and make injury more likely.

Q: Why should new runners increase their distance gradually?

The aerobic system adapts to running more quickly than the musculoskeletal system. This can allow someone to run farther than their body can tolerate, creating trouble before their bones, joints, and other tissues have adapted.

Q: Why is physical activity important as people age?

Physical activity activates repair and maintenance mechanisms that prolong life, slow aging, and help people remain healthy. Professor Lieberman argues that humans evolved to be active grandparents rather than becoming progressively inactive in later life.

Q: How active are hunter-gatherer grandmothers in the example discussed?

The cited study found that mothers spend about two to five hours a day foraging, while grandmothers can spend four to eight hours doing so. Their additional work creates a surplus that they can provide to their children and grandchildren.

Q: Why does Professor Lieberman reject the idea that retirement should mean inactivity?

He argues that humans did not evolve to retire or stop being physically active with age. Hunter-gatherers who survive childhood typically live into their seventh decade, and older family members continue working through activities such as foraging, hunting, and digging up tubers.

Q: Why does the “just do it” approach to exercise fall short?

Professor Lieberman says people were traditionally active because movement was necessary for survival or because it was social, fun, and rewarding. Commercializing and medicalizing exercise have not been very successful, since only 20 percent of Americans manage 20 minutes of physical activity a day in the example he gives.

Summary & Key Takeaways

• Running is an essential part of physical activity, which humans evolved to do millions of years ago.

• Running does not cause arthritis and may actually help prevent it by strengthening cartilage in the knees.

• Proper running form and gradual adaptation to the stresses of running are important for injury prevention.