Meant only as an explanation not an insult ok..........
1 gain 50 pounds (or whatever needed) to aquire 'Manboobs"
2 Stand in front of mirror with your hands at your side and take note of size of "manboobs"
3 Raise hands to same position(Icosolese (sp?) firing position) and compare size of "manboobs" with process in #2
4 repeat #2 and #3 several times for accuracy in variables
5 Return to the above picture and .......well use ur imagination