A centerline of each handhold passes through {HEAD ~ the center} of the corresponding glenohumeral joint of {TAIL ~ the user} during the exercise 
A centerline of each handhold passes through { HEAD ~ the center } of the corresponding glenohumeral joint of { TAIL ~ the user } during the exercise
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH