Human growth hormone is a secreted protein that stimulates growth and cell reproduction. in the 1960s it was discovered that this was an effective treatment for a form of dwarfism. however, before it was genetically engineered, it was

The answer is that it was harvested from cadavers which are corpses of a body that is deceased—they are used before the treatment that is effective for dwarfism was genetically engineered and by this, there has been some studies and researches that has been found out when they harvested from the cadavers.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.