Cross training the right blend for Today

If you had a kind friend who was physically fit, but had no formal training, and he said to you, “my job is going to require i move to (fill in whatever horrible place, inner Detroit, Bronx, French quarter, etc…) and i want to be prepared. I have 6 months to prepare. What should i train?”

What would you advise he learn in that period of time to protect himself? Moves? Styles? Weight training? Sports? What would you recommend and why?