Kris Stallenberg 30-min Z1 (Active Recovery) Medium #04 The goal of 'The Breather' is mental and physical relaxation on the bike. A steady, uninterrupted block of Zone 1 spinning allows you to focus on diaphragmatic breathing, helping to lower stress hormones and promote a parasympathetic (rest and digest) state. This is as much a mental refresh as it is a physical one. bike