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
Electric and magnetic fields are generated by the equipment inside the substation or transformer and the cables going in and out. Sometimes substations are interconnected in such a way that high magnetic field levels are created in a wide area, affecting many houses, especially those with small or no front gardens.ubstations are part of the electricity supply network that enables the widespread use of electricity at home, work, places for education, leisure, commerce, health care, etc.