In endless bandwidth of YouTube there is quite bit of content on chiropractic adjustments, Manual therapy and some crazy shit in the name of ASMR
I religiously watch those shit for a long time, started to experiment on unfortunate family members.
The most basic and easy to do manipulation is neck manipulation.
I think it is nearly impossible to find someone without a bit of stiffness on their necks, upper back or traps.
Cracking your own neck is quite different than letting your neck manipulated.
You just sit there relaxed, you let your cracker first rotate your head left and right, and a little bit of upright angle is needed to able to get a good crack, with basic physics, cracker push with one hand and pull with the opposite hand, this pivoting movement encourages neck to move bit more than its limited plain of motion and, viola you have been cracked in the convenience of your home or office.
Why am I writing all those, to let you satisfy your desperate wifes without having to visit chiros office, and if it goes all wrong, just blame stroke, it happens millions of women every year.
İf you are as dumb as İ am, teach your wife how to do it, and share the risk, it is better than receiving a handjob from your old lady