"Masters Made by Shiko Training: Japan's Traditional All-Purpose Training" Tetsuhiro Matsuda / Former Ichinoya Price: ¥1650 Sumo wrestlers become incredibly strong just by doing shiko! What's the special reason for that!? A super-theoretical, exceptional former sumo wrestler explores from multiple angles the true meaning of how shiko training has created strong individuals, something no one knew! It wasn't squats or stretching! Shiko has significant effects that can be obtained without raising your legs high or stomping hard. That is, "working the deep muscles and connecting the whole body." The truth of shiko training, which has rarely been discussed because it's not a straightforward training like muscle training, is revealed! ⚠️ Photo 6, there is a crease on the obi (sash).