A straight forward punch that involves the user constricting their muscles and striking the user with their body from the muscles flexes. The technique is a karate practitioner's straight punch, shot from waist. Seiken-Tsuki is a punch with the first two knuckles. The punch is the first technique all karate fighters learns when entering the dojo.
The technique is also nicknamed as "Seiken".Punching techniques in the karate are called tsuki or zuki.