The Yoga Fitness Plan What does fitness mean to you? For many it means looking great in their swimsuit and generally feeling healthy. For others, fitness means being able to perform at a high level in a particular sport. Consider fitness as being an overall quality of wellbeing. A fit person is someone who is at a healthy weight, has a strong immune system, and a good sense of wellbeing. They may not be a competitive athlete, but they are confident in their body and able to perform a variety of tasks.