Everybody has their takes on the simplistic whole-body techniques of the Xingyi Five-Element Fists.
Above, Hal Mosher (Website Here) demonstrates some attacks and counters, each partner using the same technique. I think Hal has some good ideas, but his video production could be better. (Hal, keep your other hand up!)
I have his Sun-style Bagua video and for the price I paid I got very little. Just Hal rolling through the palm changes one time with no verbal description or application. None-the-less, Hal has some good stuff which stimulates other ideas.
Below is another old favorite, Sifu Rudy and B.T. doing their version of a drill, alternating between fists:
For traditionalists, drills like these help students get a general idea of how the forms they practice can be used in application and as a bridge to some light free-sparring. I like to think about mixing this in with Tai Chi Chuan push-hands, so you get a little standing grappling with hitting and neutralizing an attack.
We have to remember, these are just drills, not actual fight training.