Zone zero: The rise of effortless exercise

It can look almost too easy: athletes gliding along on a bike, runners shuffling at a pace slower than most people's warm-up, or someone strolling so gently it barely seems like exercise at all. Yet this kind of effortless movement is at the heart of what's becoming known as zone zero exercise.

source https://medicalxpress.com/news/2025-08-zone-effortless.html