kondicija

1. fitness; stamina
   Nemam kondiciju, zadihao sam se na stepenicama. — I'm out of shape, I got out of breath on the stairs.
   Igrači su u odličnoj kondiciji. — The players are in excellent shape.
2. (figurative, of machines, economy) condition; working order
   Auto je još u dobroj kondiciji. — The car is still in good condition.

Usually used as imati kondiciju or biti u kondiciji. The neutral general word for "condition, state" is stanje.