1. A bird's heart is on average 40% larger than the heart of a mammal. This is because flight requires incredible circulation.
2. Flight burns up enormous amounts of energy. Birds consequently have very efficient digestive systems. To stay as light as possible, they don't have the luxury of storing energy. Only during migration do birds begin to stock up.
And then, I thought, why not substitute 'bird' for 'cyclist' and 'flight' for 'cycling'? After all, and as I've intimated elsewhere on this blog, cycling is a form of flying.
1. A cyclist's heart is on average 40% larger than the heart of a non-cyclist. This is because cycling requires incredible circulation. (And also because he has not closed himself off to his environment, sharing a fundamental and vital solidarity with all living breathing creatures).
2. Cycling burns up enormous amounts of energy. Cyclists consequently have very efficient digestive systems. To stay as light as possible, they don't have the luxury of storing energy. Only during migration do cyclists begin to stock up.
Much better, no..?
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