Coach Robb Beams and Derek Harris (HP Race Development) tackle one of the most misunderstood issues in racing performance: the root cause of arm pump. Too often, parents and riders default to blaming suspension setups or motor output, but as the discussion reveals, most of these issues stem from physiological deficiencies—specifically, inadequate strength, flexibility, and aerobic capacity. Mechanical upgrades are only effective if the rider’s body is equally prepared to handle the forces inv...