I have often wondered how do their bodies take all those injection shots year after year, the body only has so many injection sites and after a few years you develop scar tissue and it becomes painfull, they must have a high pain treshold.
My guess would be cycling the injection sites and using fresh needles because they can quickly get dull.
please always use a fresh needle, every single time. use two: one large gauge to draw the liquid into the syringe, then a smaller gauge to inject. needles are cheap and readily available. then use a gatorade bottle or other clear plastic bottle with a wide mouth to store the used ones.
People usually reuse old needles?
I knew a guy back in NC that did this, got an abcess in his thigh, and had to have a huge chunk of meat removed. His quad will never look normal again.