Walking (also known as ambulation) is one of the main gaits of locomotion among legged animals, and is typically slower than running and other gaits. Walking is defined by an 'inverted pendulum' gait in which the body vaults over the stiff limb or limbs with each step. This applies regardless of the number of limbs - even arthropods with six, eight or more limbs.

The word walk is descended from the Old English wealcan "to roll". In humans and other bipeds, walking is generally distinguished from running in that only one foot at a time leaves contact with the ground and there is a period of double-support. In contrast, running begins when both feet are off the ground with each step. This distinction has the status of a formal requirement in competitive walking events. For quadrupedal species, there are numerous gaits which may be termed walking or running, and distinctions based upon the presence or absence of a suspended phase or the number of feet in contact any time do not yield mechanically correct classification. The most effective method to distinguish walking from running is to measure the height of a person's center of mass using motion capture or a force plate at midstance. During walking, the center of mass reaches a maximum height at midstance while during running, it is at a minimum. Definitions based on the percent of the stride during which a foot is in contact with the ground (averaged across all feet) of greater than 50% contact corresponds well with identification of 'inverted pendulum' mechanics and are indicative of walking for animals with any number of limbs, although this definition is incomplete. Running humans and animals may have contact periods greater than 50% of a gait cycle when rounding corners, running uphill or carrying loads.

Ludovico Einaudi OMRI (Italian pronunciation: [ludoˈviːko eiˈnaudi]) (born 23 November 1955 in Turin, Piedmont) is an Italian pianist and composer.

Einaudi was born in Turin, Italy. His mother played to him on the piano as a child. He began his musical training at the Conservatorio Verdi in Milan, gaining a diploma in composition in 1982. That same year, he studied with Luciano Berio and gained a scholarship to the Tanglewood Music Festival.

After studying at the Conservatory in Milan, and subsequently with Berio, he spent several years composing in traditional forms. In the mid-1980s he began to search for a more personal expression in a series of works for dance and multimedia, and later for piano. His music is ambient, meditative and often introspective, drawing on minimalism, world music, and contemporary pop. He has made a significant impact in the film world, with four international awards to his name.^{[citation needed]}

His father, Giulio Einaudi, was a publisher, and his grandfather, Luigi Einaudi, was President of Italy between 1948 and 1955. He currently resides on a vineyard in the Italian region of Piedmont.

Jennifer Kate Hudson (born September 12, 1981) is an American recording artist, actress and spokesperson. She came to prominence in 2004 as one of the finalists on the third season of American Idol, coming in seventh place. She made her film debut in the 2006 film Dreamgirls, which won her an Academy Award for Best Supporting Actress, a Golden Globe Award, a BAFTA Award, an NAACP Image Award and a Screen Actors Guild Award.

She won a Grammy Award for her eponymous debut album, Jennifer Hudson, which was released in 2008 on Arista Records and was certified gold by the RIAA for selling over 800,000 copies in the US; sales exceeded 1 million copies worldwide. Additionally, it spawned the hit single Spotlight. Her second album, I Remember Me, was released in March 2011, and reached number two on the Billboard 200, selling 165,000 copies in its first week of release. The album was certified gold by the RIAA, for shipping over 500,000 copies in the US.

In late 2008, after Hudson's mother, brother and nephew were killed in a shooting, Hudson stepped out of the limelight for three months. Hudson resumed her public appearances in 2009, and has since performed at the Super Bowl XLIII, the Grammy Awards, American Idol, and The Oprah Winfrey Show. Hudson has been described as a friend of President Barack Obama, who invited her to appear with him at a fundraiser in Beverly Hills in May 2009. She also performed at the White House at the "Celebration of Music from the Civil Rights Movement" event. Her vocal range is mezzo-soprano. Hudson has sold 1,280,000 albums and 2,237,000 tracks in the United States as of February 2012.