The fitness tag is currently used on 7 questions, the sport tag is currently used on 8 questions. Both lack a tag excerpt.
Should these be separate tags? If yes, how do we define them?
Somewhat related, but I guess different enough, is the tag health, which is currently used on 17 questions.
On Creating tag synonym: the 5 points rule, the tags "fitness" and "health" were mentioned.
fitnesscould be a synonym to eithersportorhealth– depending on context. Stand-alone, I'd say it's ambiguous (Fitness = "good health state" || "doing excercises"): "depending on your personal fitness … you might need doing some fitness training".