MMA training is usually harder than boxing because it combines multiple fighting styles, including striking, grappling, wrestling, and submissions. Boxing mainly focuses on punches, footwork, defense, and conditioning. MMA athletes must develop strength, endurance, flexibility, and techniques from several disciplines, making training more demanding overall. However, boxing training is still extremely intense and requires excellent stamina and discipline. The difficulty depends on personal fitness levels, goals, and how seriously someone trains in either combat sport.