Civilization has only been made possible because of our upper body strength and our ability to dexterously use our arms and hands. Push-ups are a great way to use the body's weight to challenge its muscles. They train all the major abdominal muscle groups plus the upper body and enable us to take on our whole body weight in our own hands. Push-Up Massacre, as the name suggests, puts your arms to the test by forcing your body to work in different muscle-loading positions. Your arms may scream a little in the process but ultimately they will just thank you for it!
Extra Credit: 1 minute rest between sets.