Trop Chops This unique collection of exercises by euphoniumist Matt Tropman is called "circuit training" because the variety of exercises are grouped in a way that maximizes efficiency and effectiveness and helps to reduce boredom. The exercises in each key progress from one to another quickly without fatigue in any one area. The first part of the book is a warm up routine including long tones, buzzing and short melodic studies. Each circuit includes basic articulations, valve dexterity and flexibility studies.