Which of the following is a primary strike technique?

A palm heel strike is considered a primary strike technique due to its effectiveness and versatility in self-defense situations. This technique allows for a strong, blunt impact delivered with the palm of the hand, typically targeting vulnerable areas of an opponent's body, such as the chin or nose.

The palm heel strike utilizes the body's natural mechanics for generating power, requiring less precision compared to other strikes, making it accessible for individuals regardless of skill level. Additionally, since the palm is used rather than the fingers, there is a reduced risk of injuring oneself during the strike, which is crucial in high-stress situations.

Other techniques listed, while effective in their own right, may not be classified as primary strike techniques in the same context. For example, elbow strikes and head strikes are often used in close proximity but require specific positioning and might not be as body mechanic-friendly as the palm heel strike. A round kick, on the other hand, involves a more complex motion and is generally used for long-range targeting rather than being classified under primary strikes, which emphasize straightforward and reliable impact.