Kris Stallenberg 75-min Z2 (Endurance) Pushing #10 The 'Grinder' is a test of mental fortitude and steady-state power. This workout features a single, 60-minute block of work that starts in mid-Zone 2, slowly ramps to the upper end of the zone, and then holds it. This continuous effort, with no recovery, is a cornerstone of endurance training within the Coggan Power Zones framework. It excels at improving metabolic efficiency and muscular stamina. The key is to stay relaxed, fuel properly, and keep your pedal stroke smooth from start to finish. bike