Cardio machines promise fat-burning zones yet science proves a 23 bpm error costs results
You step onto the treadmill at 7:15 AM. The display flashes green at 120 beats per minute. “Fat-burning zone optimal” appears on screen. You trust the machine’s promise for twenty focused minutes. Exercise physiologists studying metabolic conditioning reveal a harsh truth. That green zone misses your actual fat-burning peak by an average of 23 beats … Lire plus









