Two years of aerobic exercise made the hearts of out-of-shape 50-year-olds behave like hearts up to 20 years younger.
Researchers randomized 61 sedentary adults, average age 53, to two years of real training or gentle yoga, then measured heart stiffness the hard way: a catheter threaded straight into the heart. The trained group’s fitness rose 18% and the main chamber went from stiff to elastic, taking in more blood at lower pressure.
“20 years younger” describes the size of the stiffness improvement, not a literal age, but the effect was real. The heart stiffening long blamed on age is partly the cost of sitting, and in middle age it’s still reversible.
https://x.com/WilliamWallace/status/2079534876114506163?s=20