Day 4: Anaerobic Intervals and New Year's Eve
An Early Start for a Big Challenge Day 4 of my London Marathon 2025 training, and here I am, braving the unholy hour of 6:30 am on New Year's Eve for a session of anaerobic intervals. It’s a bit like starting a diet at a buffet—ambitious and faintly ridiculous, but you press on anyway. The Workout: Intervals That Test Your Limits After a 15-minute warm-up that mostly involved trying to convince my legs they weren’t still in bed, I launched into the main workout: 5 intervals of 40 seconds running hard at a 4:10 min/km pace. Between these sprints, I took 3-minute recovery periods, walking until my heart rate settled down to something vaguely human before easing into a gentle jog. The Science of Anaerobic Training For those unfamiliar, anaerobic exercise is essentially the art of asking your body to produce energy without enough oxygen, relying on the lactic acid system instead. This works by burning carbohydrates in a way that, while efficient, leaves your muscles with that delightfu...