I am interested as to what all previous training people have before they started parkour like martial arts, sports, and such. I think it helps give a understanding as to what all elements composed each traceur. If you have the time to give a nice little explanation of how it affects you now (in the pk world) that woudl be great.
Martial Arts:
2+ yrs Brazilian Jiu Jitsu
2 yrs Muay Thai
1 1/2 yrs Capoeira (Angola)
Sports:
2 yrs soccer
1/2 yr skateboard
1 yr tennis (mostly just to be around the ladies

)
Even though I may not actively train all this in a dojo or school, the elements are still within me and are applied when relevant.
I started doing "monkey walking" on a regular basis and I always incorporate Capoeira movements when doing that. I do Muay Thai exercises because of its many leg conditioning benefits. BJJ, Capoeira, and skateboarding have all helped increase my balance, stamina, and coordination.