10 Reasons Why Learning Martial Arts Can Transform Your Life: A Guide by Mario Boser, a 4th Degree Black Belt Taekwondo Trainer As a 4th Degree Black Belt Taekwondo Trainer with over 30 years of experience in countries like Germany, Austria, Slovakia, and the UK, I have seen firsthand the transformative power of martial arts. … Continue reading Mario Boser – Taekwondo Trainer in Košice in Slovakia