The best replacement for cracking is hacking.

The best alternatives to cracking are rated as following:
★★★★★  hacking
★★★  popping knee
★★  crazing
★  pyrolysis
★  hydrocracking
★  peeling fingernails
★  popping
★  thermal cracking
★  packing

Your alternative for cracking is not listed? Suggest!
Speaking about cracking, one probably shouldn't forget about bending.

Other search terms related to cracking and their ratings are:
★★★★★ bending
You have in mind a companion for cracking and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cracking in all years. Click on graph for more.
cracking
hacking
popping knee