Qi and momentum in calligraphy are two different concepts. Each calligraphy style pays attention to Qi, such as the movement of Qi in the layout, etc., while in running script, small grass, and large grass, especially large grass (Kuaicao) pays attention to "momentum", so if you like the characters with momentum, it is Kuangcao. You can use Lin Huaisu's "Zixi Tie", or Zhang Xu's "Cursive Four Posts", but it is very difficult! .The hard pen can be learned from Liang Dingguang for reference!