This is a 2:26 minute video demonstrating the Kata Tekki Shodan together with demonstration of a number of techniques from the Kata.

Contrary to popular belief there are no blocks in Karate! Many of the movements were renamed blocks when the watered down art began to be taught to school children in Japan. This technique uses two "down blocks" against a push or strike to take the aggressor to the ground and is simple yet effective.

Notice the defender does not try to remove the hands from her neck directly but uses multiple strikes into various pressure points. For safety reasons she is obviously just touching the points rather than striking with full power and intent.

This is a longer video (10:26 minutes) demonstrating two basic flow drills. It then shows variants of the flow drill and  moves on to using the flow drill as and entry to various techniques. The final section shows techniques from Heian Shodan which is the very first Kata taught.