fitness (disambiguated)
Fitness may refer to any of a number of things, so try these tags instead:
gym
Referring to a gymnasium.
gym_equipment
Referring to equipment typically found in a gymnasium context.
ie: weights; yoga mats; jump ropes; stationary bikes; ect.
exercise
Referring to an act meant to encourage physical fitness.
ie: jogging; weightlifting; yoga; etc.
athletic
Referring to a character's body type.