Leslie Kai Greene (born July 12, 1975), known professionally as Kai Greene or Kai L. Greene, is an American IFBB professional bodybuilder, personal trainer, artist, and actor. He came in second place at the 2012, 2013, and 2014 Mr. Olympia competitions.

Leslie Kai Greene ^{[22] [1]} was born in Brooklyn, New York, on July 12, 1975.^[2] From the age of six, he was raised in foster care and residential treatment centers in Brooklyn.^[3] According to his online biography, his rapid physical growth and development drew the attention of his seventh grade English teacher, and since his behavior in school was troublesome, he was introduced to teenage bodybuilding competitions.^[4].

Greene became an enthusiastic bodybuilder, competing in the National Physique Committee (NPC) and aiming to move into the IFBB. He perceives his success in the NPC as mixed. Although he won the 1999 NPC Team Universe, he was disappointed and took a five-year break from competitions, before re-emerging in the 2004 NPC Team Universe contest, which he won again.^[5] This victory qualified him for a career as an IFBB professional bodybuilder.

In 2011, Greene began working with preparation coach George Farah and placed 1st in the 2011 New York Pro Championship. His 3rd-place finish at Mr. Olympia in 2011 qualified him for the 2012 contest, so he did not compete at the 2012 New York Pro in order to focus on Mr. Olympia. He placed 2nd in the 2012 Mr. Olympia, the 2013 Mr. Olympia, and the 2014 Mr. Olympia.^[6]

Greene did not compete in the 2015 Mr. Olympia due to unknown circumstances. He issued the statement, "There is a lot more going on behind the scenes that I cannot discuss." Olympia officials allegedly denied any claims that he was banned from competing, but did confirm that he did not register and had been reminded several times since May of that year. Greene did request an extension on the registration period in May; it was extended until July, but he did not meet this deadline either.^[7]

On March 5, 2016, Greene won the 2016 Arnold Classic, which he had also won in 2009 and 2010.

On June 23rd, 2017, Greene was given a special offer personally by NPC chairman and CEO of Mr Olympia to join that current year's Mr Olympia competition without going through qualification, as required for all of the other competitors in the 2017 Mr Olympia. Kai Greene decided not to enter the 2017 Mr. Olympia.

In 2009, Greene worked with director Mike Pulcinella to release Overkill, which documented his preparation for his first appearance at the 2009 Olympia. In 2010, he reunited with Pulcinella to film the sequel Redemption, showcasing his training and philosophies for the 2010 Arnold Classic, which he won for the second year in a row. He features in the 2013 film Generation Iron, detailing the lead up to and events of the 2012 Mr. Olympia competition. He was also featured in the film's sequel, Generation Iron 2.

Greene was sponsored by Flex. He launched his own supplement brand, Dynamik Muscle, in 2015. In May 2016 Greene launched his own training program called "The 5P".^[8] The name is an acronym for Greene's motto: "Proper Preparation Prevents Poor Performance".^[9] Greene is also sponsored by sportswear company Ryderwear, who have released lines of signature clothing and footwear in his name.

In November 2015, Greene and fitness model Krystal Lavenne began co-hosting a weekly podcast titled Generation Iron, in which they discuss various topics while answering questions sent in by fans.^[10][11]

Greene has often discussed the "mind-muscle connection". In an article published by Flex as part of his Top Ten Big Back Principles, he explained, "The mind-muscle connection is the number one factor in training. You develop it over time by posing your muscle, and also by paying close attention to how your muscles feel when you work them. Eventually, you get to where your mind can read the feedback your muscles are providing, and your muscles can react to the stimulus your mind is providing. Practice posing between sets or anytime. And feel your muscles working throughout your sets. Eventually, your mind and muscles will speak the same language and communicate back and forth."^[12]

Greene portrayed a male stripper in the 2015 comedy film College Debts. In November 2016, he travelled to the Chinese province of Guizhou to start filming for the martial arts film Crazy Fist, scheduled for release in 2018. He will play a villain who fights the protagonist in an arena during the film's opening sequence.^[13] In January 2017, it was announced that Greene had signed with The Gersh Agency.^[14] He played Funshine in the second season of the Netflix sci-fi series Stranger Things.^[15]

Greene is an avid artist who often creates self-portraits to help himself build and maintain his ideal physique.^[16][17] In August 2011, he exhibited some of his work to the public; at the exhibition, he stated, "As a professional bodybuilder, I'm a master sculptor. The art show made me realize that I've always been an artist: my medium the human physique. My life is what I make it, just like the art I've produced on canvas and on stage. This art show makes this statement. I'm celebrating some personal accomplishments and my own artistic expression."^[18]