Patent ID: 7666118

Claim:
A system for gathering exercise parameter data during the performance of a free-weight lifting exercise comprising: one or more portable elongated housings each supporting a plurality of aligned pairs of electromagnetic wave emitters and mating electromagnetic wave detectors mounted in said housing in a side by side relationship, electromagnetic waves produced by the emitters forming a light curtain; a free weight barbell support structure having at least one vertical upright support, said vertical support structure supporting a barbell physically unconnected to said barbell support structure; a means for removably connecting said one or more portable elongated housings to said vertical upright support in an operative position with a light curtain being projected by said emitters substantially in a horizontal plane and perpendicularly through the vertical range of motion of concentric and eccentric repetitions through which said barbell moves during performance of an exercise routine by an exerciser, whereby interruption of the wave emitted from each of said wave emitters and reflected off a surface of said barbell when moved by an exerciser into the path of said waves is record by each of said mating wave detector; electronic means for gathering and converting information collected by said detectors into exercise parameter data as well as for storing said data; and a display panel for displaying said data; wherein said waves are emitted in a diffuse pattern to prevent said detectors from detecting waves produced by adjacent wave emitters.