9th Dan Uechi Ryu master Kiyohide Shinjo training with Sanchin jars.
Okinawan karate has several training techniques that are designed to strengthen and condition the body using simple everyday objects. Sanchin are heavy jars that are gripped with the fingertips. Makiwara is a striking post the top of which is often wrapped in leather or straw. It is similar to a boxers punching bag, but with a smaller target.
10th Dan Shorin-ryu Karate Master Sokuichi Gibu training with makiwara