Here are pictures and information on extreme bodybuilders, namely Gregg Valentino, Markus Rühl, Ronnie Coleman, Arnold Schwarzenegger, Lou Ferrigno & Johnnie O. Jackson. These guys have pushes their bodies to extraordinary limits!

Gregg Valentino: World's Biggest Biceps

Gregg Valentino is one of the most controversial yet popular bodybuilding icons. He started bodybuilding at the age of 13. After over 23 years of training naturally Gregg decided to experiment with steroids. During this time his arms grew from an impressive 100% natural 21" to an in-human 28". So how much can Greg bicep curl? A whopping 300 pounds!

Markus Rühl: some of the biggest shoulders in history

Well known for his freakish size, german Markus Rühl is a former IFBB professional bodybuilder. He possesses some of the biggest shoulders in bodybuilding history, and is one of the strongest bodybuilders alive along with Johnnie O. Jackson and Ronnie Coleman.

Ronnie Coleman: eight straight wins as Mr. Olympia

Born May 13, 1964 in Bastrop, Louisiana, Coleman is a retired American professional bodybuilder who shares the record of eight straight wins as Mr. Olympia. He also holds the record for most wins as an IFBB professional with 26 wins. Coleman graduated Cum Laude from Grambling State University with a degree in accounting.

Arnold Schwarzenegger: youngest Mr. Universe at age 20, then won Mr. Olympia seven times

Before becoming a famous actor and a controversial politician, Schwarzenegger was considered to be one of the greatest and most influential names in the field of body building to this day. Schwarzenegger began weight-training at 15 and became the youngest Mr. Universe at age 20 and going on to win Mr. Olympia a total of seven times. Schwarzenegger has remained a prominent face in the bodybuilding sport long after his retirement, and has written several books and numerous articles on the sport.

Lou Ferrigno: the Incredible Hulk

Known for being long time bodybuilding rival of Arnold Schwarzenegger and the original Hulk on the TV show, Lou Ferrigno was also a deputy sheriff. After graduating from Brooklyn Technical High School in 1969, Ferrigno won his first major titles, IFBB Mr. America and Mr. Universe, four years later. In 1974, he came in second on his first attempt at the Mr. Olympia competition. He then came third the following year, and his attempt to beat Arnold Schwarzenegger was the subject of the 1975 documentary Pumping Iron. Following this, Ferrigno left the competition circuit for many years, and went for his acting career.

Johnnie O. Jackson: notable powerlifter

As you can see, Johnnie O. Jackson may not be the biggest bodybuilder around, but the thickness and density of his muscles are mind blowing. They pop out and he isn't even flexing them. Just sitting relaxed. He won the 2006 Montreal Pro, 2001 NPC USA Championships, among others.