of depleting your stores than running slowly," Holt explains. BREAK IT: Take the breath test. "Gauge if you’re burning glycogen by the level of your breathing," Holt advises. "If you’re puffing and panting, you’re working too hard and burning up your glycogen
, what you ate, the weather and even your general mood before, during and after each run," adds Wood. "It'll help you identify patterns and the cause and effect of good and bad runs." And training logs don't have a ‘use by' date. "I have all my training
