The Engine: Physiology of Endurance on the Trail
Your aerobic base powers steady efforts on endless fire roads and grinding singletrack. By training comfortably below threshold, you build mitochondrial density, capillarization, and fat utilization, transforming long climbs from survival into controlled, patient progress.
The Engine: Physiology of Endurance on the Trail
A higher lactate threshold lets you handle steeper pitches and punchy technical sections without redlining. Tempo and sweet spot intervals raise the ceiling, so you recover faster between surges and maintain a strong, even pace over demanding terrain.