Magness and Bitter push back on "jogging wrecks your knees"
A viral post told people to walk and sprint and skip everything in between. Two well known names in running answered it the same day.
A post from Sean OMara MD, JD telling people to stop jogging got answered fast by two of the more recognisable voices in distance running.
OMara's post said that of all the ways to exercise, the light jog is one of the worst. His argument was ancestral. He wrote that your ancestors walked most of the day and ran all out when they had to go after prey, or run away from a threat, or toward a child in danger, and that they did not jog. His advice was three words. "Walk. Sprint. Skip the middle." He also claimed the daily four mile jog has destroyed your knees for nothing.
Walk. Sprint. Skip the middle.
Magness answers point by point
Steve Magness replied that the post is wrong on so many levels and listed three reasons. One, he says research shows running is likely protective to your knees, and at worst does not harm them. Two, he says the ancestral framing is backwards, because ancestors walked lots, jogged, ran steady, ran hard and sprinted, all within the same hunt. Three, he took a shot at the original poster's own running, writing that "this guys sprint is slower than a jog."
Research shows that running is likely protective to your knees, and at worst, doesn't harm.
Zach Bitter kept it to one line. He replied that he is over 100,000 lifetime miles and his knees are fine.
What it actually means
There is no new study here. Magness points to the existing body of research rather than anything published this week, and Bitter is offering one very extreme sample size of one. What makes this worth two minutes is how predictable the exchange is. The claim that easy aerobic running grinds the joints down keeps circulating, and it keeps getting the same answer from the people who log the most miles.
If you train for marathons, the practical content of the original post is the part worth clocking. It is an argument against the easy middle, the steady aerobic volume that most marathon plans are built on. Magness's counter is that the middle is not the part that hurts you, and that the walk and sprint split is a misreading of how people actually moved. Neither man cites a specific paper in the posts themselves, so treat the claim about protection as Magness's summary of the research rather than a result you can look up from his tweet.
The cleanest version of the rebuttal remains Bitter's, which is less an argument than a receipt.
I am over 100,000 lifetime miles and my knees are fine.
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