Someone who communicates both verbally and physically. A training partner who matches your intensity and uses technique over strength. I believe every roll should be a learning experience for both partners.

And neighbors!

I have 6 but some of them may have shrunk. 

Controlling your breathing.  

Giving up the hand fighting to deal with the hooks. The opportunities are slim especially if you have a patient partner. 

Survival is a goal. Have small goals.