I talk to Greg Souders and Priit Mihkelson, two of the most forward-thinking jiu-jitsu coaches today, about their philosophies on training methodology and practice design. Greg advocates for an ecological approach focused on constraints and foundational functions, while Preet comes from a background utilizing progressive resistance. We have an in-depth discussion on motor learning, developing skills, and the merits of different systems like ecological dynamics versus traditional step-by-step technique instruction. They analyze how to best structure training sessions, teach students, and elicit desired skills with games and drilling. A debate between two grappling philosophers on the cutting edge of instruction and understanding what it takes to excel at BJJ.