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 sublease is a new lease agreement between the tenant as sublessor and a third party as sublessee for all or a portion of the leased premises. The original lease between the tenant and the landlord remains in place, unaffected by the sublease.