The best replacement for kung fu is karate.

The best alternatives to kung fu are rated as following:
★★★★★  karate
★★★★  mma
★★★  muay thai
★★  taekwondo
★★  boxing
★★  tae kwon do
★★  aikido
★★  yoga
★  judo
★  krav maga
★  jiu jitsu
★  wushu
★  bjj
★  tai chi
★  karate video
★  ninjutsu
  jujitsu
  kickboxing
  street fight
  wing chun
  karate which is best
  gung fu
  gangster
  karate which is better
  wrestling
  ufc
  silat
  martial arts
  shotokan
  hercules
  hapkido

Your alternative for kung fu is not listed? Suggest!
Speaking about kung fu, one probably shouldn't forget about bruce lee.

Other search terms related to kung fu and their ratings are:
★★★★★ bruce lee
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Google Trends

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