After a hard session of pumping iron, you come home and ejaculate into a cup. You then combine protein powder with the semen in the cup to create an extra potent protein shake. This process has the added benefits of raising ones testosterone levels (by climaxing), and making you feel as though you are saving the world through recycling.
"After doing chest and tri today I only had one scoop of 24g protein powder, so I decided to double down to boost my recovery."
"Dude... that's really gay..."
"Nah bro, these dancing pecs get me so much pussy at the bar."