John Geyston has been running successful martial arts schools for 39+ years in Springfield, IL. He trains his students in Mixed Martial Arts, Muay Thai Kickboxing, Brazilian Jiu Jitsu, Fitness Kickboxing and Karate. Recently, Ron Sell sat down with him to see how he uses Spark to save over $3,200 in staff payroll per month, save time, and increase his …