Be Your Best is one of two winners out of the unraced Kamakura (Medaglia), whose older daughter I'm Glad (Kingman) is in foal to Flameaway. The other winner is her two-year-old half-brother Postmodern (Too Darn Hot), successful on his debut over 6f at Yarmouth.

Second dam Kotuku (A.P. Indy), placed once, is also the dam of Fortify (Distorted Humor), a dual winner and sire who was placed in the Grade 1 Champagne Stakes, of Bay of Plenty, a full brother to Kamakura who won at Listed level, was Grade 3-placed and became a sire, and of the dual winner Big Team (Speightstown), placed in the Listed Curlin Stakes. Kotuku is a full sister to Anasheed, a dual winner, sire and Group 3-placed, and a half-sister to the Listed-placed dual winners Dubai Belle and Marhoob (both Mr Prospector), the latter raced as Marhoub in Saudi Arabia and stands there as a sire.

Third dam Flagbird (Nureyev), a multiple Group 1 winner whose wins included the Premio Presidente della Repubblica, then a Group 1, produced the dam of the Grade 1 winner Little Belle, who in turn produced the Grade 1 winner Dickinson.

Kamakura has a yearling filly by Baaeed and a colt foal by Cody's Wish.