What technique is used to strike the top of the forearm?

To strike the top of the forearm effectively, using an empty hand is the most suitable technique. This approach allows for precise targeting and can generate the necessary impact without needing additional movement or momentum that other methods may require. In self-defense situations, utilizing the palm of the hand to strike with an open hand can provide both power and control, which is essential when focusing on a sensitive area like the forearm.

The technique of striking with a foot may not effectively target the forearm directly and could require the individual to be in a specific position to land the strike appropriately. Similarly, using a knee also lacks the direct effectiveness for targeting the forearm, as knee strikes are typically aimed at different areas such as the torso or legs. Additionally, while striking with a palm could be a viable option, the choice of an empty hand specifically facilitates a more controlled engagement, which is critical in defensive tactics. Therefore, the option of striking with an empty hand stands out as the most effective technique for that purpose.