These numbers on paper—tidal volume, vital capacity—I learned them by heart when my son was diagnosed with asthma. Doctors say a normal vital capacity is around 4.8 liters for a man, but in our home, we measured it by whether he could blow out his birthday candles without a tightness in his chest. The chart's 'normal' never accounted for the dust from the kuchha road during summer, which would steal his breath away. So those values were a map, but his lungs were the real terrain, beta.
#fitness#health
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