A two-stage eutectic metal brush assembly having a slip ring rigidly coupled to a shaft, the slip ring being electrically coupled to first voltage polarity. A BSI system may be incorporated in a well system for accessing natural gas, oil and geothermal reserves in a geologic formation beneath the surface of the Earth. The subject performs a plurality of isometric contraction exercises using exercise equipment always in the presence of a personal fitness trainer thereby producing an exercise result. The frame further includes cable storage spools for the patch cables.