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All three of these cardio machines will burn calories and exercise your heart and lungs. The treadmill gives a great full-body workout, but the elliptical and bike are low impact, which is beneficial for those prone to joint pain or knee injuries.

The tendency of a person to remain at a relatively stable level of happiness despite a change in fortune or the achievement of major goals. According to the hedonic treadmill, as a person makes more money, expectations and desires rise in tandem, which results in no permanent gain in happiness.

1) Step onto the machine facing the monitor. 2) Begin pedaling to turn it on.3) Start pedaling at an even pace. 4) Do not lock your knees. 5) Turn up the resistance. 6) Increase the incline and resistance as you go.

Treadmills range in price from $900 to $3,000. Precor is part of the Finland-based Amer Sports Corporation. Its treadmills can be purchased nationwide at specialty fitness stores. Prices range from $2,500 to $7,000.

Treadmills were invented in 1818 by an English engineer named Sir William Cubitt, son of a miller. Noting idle prisoners at Bury St Edmundsgaol, he proposed using their muscle power to both cure their idleness and produce useful work.

Exercising on a treadmill often feels like torture, and that's not exactly a coincidence. In 1818, an English civil engineer named Sir William Cubitt devised a machine called the ﾓtread-wheelﾔ to reform stubborn and idle convicts. (Hence the eventual name treadmill.)