Isotonic exercises involve moving your joints and muscles rhythmically and repetitively through their ranges of motion using low resistance, while isometric exercises are static and require you to contract your muscles without joint motion.
Substations are normally outdoors and are enclosed by a wire fence. However in residential or high density areas, the substation may be indoors and housed inside a building to restrict the humming noise of the huge transformers. slide 2 of 6 View of a Substation
A fire station (also called a fire house, fire hall, or firemen's hall) is a structure or other area set aside for storage of firefighting apparatus such as fire engines and related vehicles, personal protective equipment, fire hoses and other specialized equipment.n a single story station, a tower-like structure is sometimes used for hose hanging. An occupied station will usually have a station alarm system for receiving and annunciating an alarm, and indications of where and what caused the alarm.