an excerpt

"Eating alone will not keep a man well; he must also take exercise. For food and exercise, while possessing opposite qualities, yet work together to produce health... And it is necessary, as it appears, to discern the power of various exercise, both natural exercises and artificial, to know which of them tends to increase flesh and which to lessen it; and not only this, but also to proportion exercise to bulk food, to the constitution of the patient, to the age of the individual..."

Regimen - Hippocrates