The best horses would often work the full distance of an upcoming race five or six days before, breeze a half-mile two days out, and maybe even an eighth of a mile the morning of the race. As but one example, three days before Assault finished off the Triple Crown, Max Hirsch sent the colt out for a 12-furlong breeze in 2:32 at Belmont Park. Allen Jerkins opined, “If you’re not breezing, you’re bleeding.”
Pithy. But even Jerkins’ horses work in the modern way. See: Emma’s Encore.