Have We Been Lied To About Zone 2 Training? | GCN Show Ep. 717

Is Zone 2 training really the magic bullet for fitness, or have new scientific studies cast doubt on its actual benefits? In this week's GCN Show, Dan and Si dive deep into the latest research surrounding endurance training, mitochondrial health, and exercise intensity. Plus, we cover big cycling news, including proposed UCI Grand Tour changes, new kit reveals, and ultra-cycling record attempts!

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