"Baby Workout" is an R&B

Rhythm and blues

Rhythm and blues, often abbreviated to R&B, is a genre of popular African American music that originated in the 1940s. The term was originally used by record companies to describe recordings marketed predominantly to urban African Americans, at a time when "urbane, rocking, jazz based music with a...

 song by Jackie Wilson

Jackie Wilson

Jack Leroy "Jackie" Wilson, Jr. was an American singer and performer. Known as "Mr. Excitement", Wilson was important in the transition of rhythm and blues into soul. He was known as a master showman, and as one of the most dynamic singers and performers in R&B and rock history...

 from the album of the same name. The track is about Wilson urging a girl to dance (work out) all night with him. It was Wilson's biggest hit of his singles that charted on both the Billboard Hot 100

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

 and the Hot R&B/Hip-Hop Songs

Hot R&B/Hip-Hop Songs

Hot R&B/Hip-Hop Songs, is a chart released weekly by Billboard in the United States.The chart, initiated in 1942, is used to track the success of popular music songs in urban, or primarily African American, venues. Dominated over the years at various times by jazz, rhythm and blues, doo-wop, soul,...

. It was his fifth and penultimate #1 R&B song. It was his second highest charting song on the pop charts, peaking at #5. It was written by Wilson and good friend Alonzo Tucker, an original member of the famed 1950s Doo Wop group, The Midnighters.