So what is koshi? That’s a little tough, because koshi not a clearly defined medical term. Koshi includes the lower back, hips, waist and pelvis. The first thing to practice is just walking while maintaining a stable, connected koshi. When you walk, do your head and shoulders stay over your koshi? Or are you a citizen of the 21st century whose head is permanently tilted forward and down, ready to check your iPhone at a moment’s notice?