Spring Forest is medicinal Qigong, focusing on healing. There are tons of different things you can practice Chi Kung(Qigong) for.
I've seen an old man practically throw seven guys lined up agains him pushing him. I've seen a man try to punch another, who just stood there, and upon making contact, the attacker was thrown backward, his wrist broken and shoes split.
These are some of the practical applications of the harnessing of 'crazy' Chi Kung, and the power and efficiency of movement that can evolve from the practice and eventual mastery of Tai Chi.