An exercise machine having a beam pivoted off {HEAD ~ center}, with a weight movable along the beam under control of {TAIL ~ a motor} 
An exercise machine having a beam pivoted off { HEAD ~ center } , with a weight movable along the beam under control of { TAIL ~ a motor }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL