Internal Iron Palm refers to the internal component of iron palm training. This includes the use of qigong and possibly dit da jow in one’s iron palm training.
It can also refer to iron palm methods that are mostly internal based, meaning they rely more on internal development and qigong training to generate power as opposed to external methods such as hitting an iron palm bag.
Strictly internal iron palm methods are rare, as most methods involve a mixture of internal and external training. Internal iron palm training involes lots of qigong and internal strengthening exercises designed to allow one to bring the qi to the hands for strikes.