Jonah Rosner | Elite Running Scientist on Instagram: "Most runners are told to stretch their calves and Achilles to run better. The problem is that efficiency does not really come from flexibility. It comes from stiffness. Your calf muscle and Achilles tendon work together as one unit. When the Achilles is stiffer, it takes on more of that stretch. That allows the calf muscle fibers to work more isometrically (this is just a nerdy term we use to mean the muscle does not move much, but it makes u

2025 honolulu marathon finish 🌴 3:58:23 (9:04 pace) | paced my dad to a sub 4 marathon!

The Wall Street Journal on Instagram: "When a new breed of super shoes hit the distance-running scene nearly a decade ago, they turned the sport on its head. The governing body of running, World Athletics, scrambled to rein in the Frankenshoes.⁠ ⁠ But recently, something strange has started to happen. Shoe companies started going over that limit, again and again, on purpose. Soles are now rising like cheese souffles, and runners are snapping up the super-sized shoes—even if they carry the risk o