these exercises are very similar to some i learned in wu mui (plum flower) kung fu.
i also apply these ideas when holding postures. (extension - projecting energy)
i don’t know if the visualizations are an important aspect, but i feel these types of exercises help teach you how to properly use only the muscles required, when striking; minimizing unnecessary muscular tension that would in effect, slow down ur punch, and hold back energy.
… but i wasn’t crazy about the sales pitch flavor to the article…