May 19, 2026
Foam, fury, and flying ankles
Energy return in running shoes explained (2025)
Why bouncy running shoes have fans cheering and haters calling them ankle traps
TLDR: The article says bouncy running shoes can help, but only when the whole shoe—and the runner—work well together, so rebound alone is not magic. In the comments, readers split into camps: some praised the data-driven approach, while others mocked modern shoes as influencer hype, ankle traps, or even something that should be banned.
The article itself is a calm, data-heavy explainer: modern running shoes can give some energy back when your foot hits the ground, which may help you run more efficiently. But the big reality check is that more bounce does not automatically mean better performance. Shoe weight, shape, stiffness, and your own running style all matter, and the piece goes out of its way to bust the internet myth that "springier" always means "faster" or "safer." It also points out that soft landings and bouncy rebound are not the same thing—a distinction that apparently lit up readers instantly.
And oh, the comments. One reader joked, "Don’t show this to Christopher McDougall," instantly summoning the eternal "natural running vs modern shoe wizardry" culture war. Another praised the site for being a rare oasis of objective reviews in a world of influencers "trying to peddle you shit they don’t understand"—which is basically the most 2025 endorsement possible. But the hottest drama came from the anti-max-cushion camp: one self-declared minimalist shoe runner called spring-loaded shoes "absolutely disgusting" and claimed they reward bad form and should have been banned. Meanwhile, a devoted flip-flop runner barged in with pure chaos energy, saying regular shoes look like ankle hazards and that flip-flops have never betrayed them. So yes: the science says running shoes are complicated, and the crowd says the real marathon is surviving everyone else’s opinions.
Key Points
- •The article defines energy return as the midsole foam’s ability to rebound after compression and release some stored energy during toe-off.
- •RunRepeat says its guide draws on lab data from more than 500 shoes tested for energy return, plus expert consultations.
- •The article states that energy return can improve running economy, but outcomes also depend on weight, stiffness, geometry, and runner biomechanics.
- •It explains that running economy is measured in lab settings through oxygen-consumption testing and cites research on Nike’s Vaporfly 4% showing about a 4% reduction in energy use.
- •The article says energy return and shock absorption are not strongly correlated, because cushioning behavior also depends on factors such as geometry, stack height, and midsole width.