Cracking your joints does
not give you arthritis.
This is a myth. One that I believed until I married my wife. She's got three degrees is human anatomy, including a Master's Degree in Manipulative Physiotherapy. She says that it doesn't cause degenerative damage to the joints and in some circumstances it's actually good for you. Can't remember the details.
Hoewver, I can't shake the memory of my mother banging me on my ear and saying "Stop that! You'll get arthritis"...
Mr Mephisto