The best replacement for crunch is sit up.

The best alternatives to crunch are rated as following:
★★★★★  sit up
★★★  nysc
★★  night slash
★★  bite
★  plank
★  dark pulse
★  planet fitness
★  hifonics
★  krackel
★  equinox
★  reverse crunch
★  shadow claw
★  la fitness
★  payback
★  bite pokemon
★  pursuit tyranitar
★  foul play
★  cascading
★  earthquake
★  body slam
★  chuze
  standing oblique crunches with leg raise
  sit ups
  bicycle crunch
  6 second abs
  comets
  situp
  payback tyranitar
  golden grams
  standing oblique crunch with leg raise
  curl up
  not to crunch
  24 hour fitness
  autotek
  big rip
  puffs
  fluff
  lucky charms
  faint attack
  lanzar
  crisp
  hashcat
  cap\u0027n crunch
  power acoustik
  situps

Your alternative for crunch is not listed? Suggest!
Speaking about crunch, one probably shouldn't forget about leg raise.

Other search terms related to crunch and their ratings are:
★★★★★ leg raise
★ aircrack
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Google Trends

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crunch
sit up
nysc