1. Good physical condition; being in shape or in condition
   "Regular exercise contributes to physical fitness";
   - physical fitness
    
2. The quality of being suitable
   "they had to prove their fitness for the position";
   - fittingness
    
3. The quality of being qualified
   "His fitness for the job was never in question"

Type of: competence, competency, condition, shape, suitability, suitableness

Antonym: softness, unfitness

Encyclopedia: Fitness