The training system, often called combat or battling rope, was first developed for combat sports suchas mixed martialarts, as a means to work out at a higher level of intensity.
The rest are licensed and adapted for the local market from Chinese and Korean gaming companies--with some misses, suchas introducing hard-core, martialarts features to Vietnam's less advanced gaming market.
Those that argue American sports fans do indeed love violence point to things suchas (1) the precipitous increase in interest for mixed martialarts and UFC compared to boxing, or (2) the fact that hockey fans go nuts whenever 2 meat heads start fighting.
What better way for Sir Menzies Campbell to prove he can succeed where other Lib Dems have failed, than by getting rid of the fly using martialarts techniques of the type seen by the wise mentors in films suchas the Karate Kid and Kung Fu...