Donating blood is amazing, especially if you're male. You get to recycle old blood, thus produce new blood in your body. It's almost like a detox. I used to give blood, mainly for the donuts afterwards, which were a great incentive for me. Now that I'm no longer eating donuts, the drive for donating blood is not as big. I'll still do it though, help save lives, though I've had experiences donating blood and fainting. Also after being pricked and prodded for two pregnancies and delivering, I'm not so keen on donating as of right now.