Out for a Spin traces her female line back to Moccasin, who has a unique claim to fame as the only 2-year-old filly to earn honors as American Horse of the Year since official voting began in 1936. Because there were multiple organizations crowning champions at the time, she shared her title with champion handicap male Roman Brother. Nonetheless, no other 2-year-old filly has come close to Moccasin's achievement.
Moccasin was a daughter of the 20th-century matriarch Rough Shod II and became a broodmare of matriarchal status in her own right. Her seven stakes winners included Apalachee (by Round Table), a horse rated so highly at 2 that he was not only the English and Irish champion juvenile male of 1973 but shared Timeform's European Horse of the Year honors with English and French champion older male Rheingold, winner of that year's Prix de l'Arc de Triomphe (FR-I).
Moccasin's daughter Flippers was not as good a 2-year-old as her dam or her half brother but was a good juvenile nonetheless, taking after her dam rather than her Belmont Stakes-winning sire Coastal. She won the 1983 Golden Rod Stakes and a division of the Pocahontas Stakes, was a stakes winner again at 3, and was Grade II-placed both years she raced. She had the stamina to stay intermediate distances, however, and when bred to 1977 American Triple Crown winner Seattle Slew, she produced a very nice filly in Hail Atlantis, winner of the 1990 Santa Anita Oaks (USA-I).
Given her excellent pedigree and her status as a Grade I winner, Hail Atlantis was somewhat disappointing as a producer of winners given that her two best runners were only up to winning listed stakes. One of those listed stakes winners, however, was Stormy Atlantic, who proved to be one of Storm Cat's best sons at stud and a good sire of turf runners. In addition, while none of Hail Atlantis' four daughters were stakes winners, all four became stakes producers.
Not surprisingly, it was listed stakes-placed Divine Dixie (by 2004 American champion broodmare sire Dixieland Band) who became the best broodmare of the group with 2005 Toyota Blue Grass Stakes (USA-I) winner Bandini (by Fusaichi Pegasus) and English Group III winner and multiple stakes producer Discourse (by Street Cry) to her credit. She is also the dam of My Mammy (by Came Home), who was listed stakes-placed as a juvenile and is now the dam of Out for a Spin, listed stakes winner Sweet Victory (by Blame) and listed stakes-placed Fernandina (by Giant's Causeway).
My Mammy is still in production and most recently produced a 2018 filly by Uncle Mo. No one can foresee what the future holds for this filly, for Out for a Spin, or for any of My Mammy's other daughters, but with the depth of pedigree these regally-bred females possess, there is every chance that one or more of them will turn out to be the kind of broodmare who throws multiple foals that, in the manner of Moccasin, have their running shoes on.