Exercise machine

An exercise machine is any machine used in exercise. These range from simple spring-like devices to computerized electromechanical rides to recirculating-stream swimming pools. An ergometer is an apparatus for measuring the work performed by exercising (or an exercise machine equipped with such an apparatus) as used in training or cardiac stress tests or other medical tests.

Weight machines
Weight machines use gravity as the primary source of resistance, and a combination of simple machines to convey that resistance, to the person using the machine. Each of the simple machines (pulley, lever, wheel, incline) changes the mechanical advantage of the overall machine relative to the weight. It is thought by many to be safer to use weight machines over free weights for most lifts. This is a view mostly funded by ignorance, as many machines force the user to use sub-optimal form.

Other kinds of resistance machines

 * Friction machines
 * Spring-loaded machines (including Bowflex)
 * Fan-loaded machines
 * Fluid-loaded machines
 * Bullworker
 * Hydraulic Equipment

Stationary bicycles

 * Exercise bicycle

Running/Walking machines

 * Treadmill
 * Elliptical trainer

Elliptical machines
Ellipticals (elliptical machines) are a combination of stair-climbing and a treadmill. Generally it contains two tracks upon which the user stands; when he or she moves his or her legs, they describe an elliptical motion (hence the machine name). Some ellipticals have magnetic resistance controls that add difficulty to doing the motion.

Glider machines
This machine allows the user to stand on two separate foot pedals and use their own muscles to create the movement. The stabilized movement can be likened to that of a "swing set" for each leg. The movement allows the user the get the same cardiovascular workout as other cardio machines (Elliptical trainers, treadmills, etc.) with out any impact on the joints.

Climbing machines
Also named stair-climbing machines, they work the user's legs as he/she pumps pedals up and down, much like climbing stairs. Some climbing machines have handles to push and pull to exercise the whole body.

Rowing machines
Rowing machines, also named rowers, simulate the body movements of using a rowing boat. By exercising on a rowing machine, one develops his or her body muscles, especially the triceps, biceps, deltoids, quads, and the entire back area. Although used mostly by professional athletes in the past, rowing machines made their way in the home fitness equipment market recently and have been constantly gaining more and more popularity.