Josh Ruble is a 6'0" professional dunker from Missouri with a 44" vertical who has added new dunks at an unusually fast rate. He goes up off two feet from a left-right plant, and his signature is the behind-the-back.
The rate of improvement is the headline. In roughly two years he went from windmills to a package that now includes double-ups, a J-Rich, Eastbays with both hands, the behind-the-back and more than fifteen other new dunks. Adding that many finishes in that window is unusual, and it happened because he treated each one as a specific project rather than waiting for his vertical to solve everything.
He also lifts heavy for the sport: a 405 pound back squat, a 455 pound deadlift, a 260 pound power clean and a 500 pound calf raise. He has been lifting since eighth grade, well before he had any reason to think it would be for this. He grew up playing basketball, football and baseball, and says jumping was always the part he actually enjoyed, whatever sport it was attached to.
His first memory of a dunker is Isaiah Rivera going over people in a driveway, an image that stuck, and he later came across Jordan Kilganon on Instagram in the platform's early days. He got his first dunk at fifteen as a one-foot jumper before switching to two, which is the harder direction to go and part of why the bag came together as fast as it did once it started.