Archibald Maclaren

Exercise is a muscular movement of force sufficient enough to engage the energetic contraction of the muscles employed.

Maclaren, 6-8.

Exercise is the chief agent for destruction and renovation of tissues, also quickens the circulation of the blood.  Exercise also produces resistance. Exercise increases the size and power of voluntary muscles employed, increases the functional capacity of the involuntary muscles employed and promotes health/strength of the whole body by increasing respiration and quickening the general circulation.

Maclaren, 11-12, 18-19.

Rowing, running/walking

Maclaren, 2-3, 47.