I think that this dictionary definition explains the word "fitness" really well: Good health or physical condition, especially as the result of exercise and proper nutrition. com/fitness
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Basically both denote the condition of being well from disease, right?That's what health indicates, however, you might be healthy but not fit.
hrsaneiMy father is healthy, but he is not fit, he gets out of breath after only 2 minutes of running.He can manage two minutes? Respect!