The brains also are shaken up like coppers in a money-box.

Riding is good, for those that are born with a silver-mounted bridle in their hand, and can ride as much and as often as they like, without thinking all the time they hear that steady grinding sound as the horse's jaws triturate with calm lateral movement the bank-bills and promises to pay upon which it is notorious that the profligate animal in question feeds day and night.
Instead, however, of considering these kinds of exercise in this empirical way, I will devote a brief space to an examination of them in a more scientific form.
The pleasure of exercise is due first to a purely physical impression, and secondly to a sense of power in action.

The first source of pleasure varies of course with our condition and the state of the surrounding circumstances; the second with the amount and kind of power, and the extent and kind of action.

In all forms of active exercise there are three powers simultaneously in action,--the will, the muscles, and the intellect.

Each of these predominates in different kinds of exercise.