As a Martial artist and instructor with decades under my belt, one of the hurdles I struggled with when I started training with kettlebells was my thoracic spine mobility, or rather, my lack thereof. Despite my mother telling me I was special, in this regard I am the rule among martial artists, not the exception. Years upon years of training for hours and hours in a boxing or kickboxing stance had encouraged my back and shoulders to retain that tight, rounded, defensive position, even when not necessary during the rest of my day.