I can't tell you anything about yoga. I can tell you something about physical fitness; it's usually achieved via good nutrition, exercise, and rest.
Yoga combines spiritual, mental and physical practices but you need to add proper nutrition and moderate exercise
Im a sports man ,Physical fitness is regular stuff I do to keep fit. Oh, yeah? Generally physical fitness can be had by good nutrition, exercise and rest. What steps do I need to take to keep my body in shape? I honestly don't know, though I can tell you that fitness is the state of being fit. So what type of  food do I need to eat regularly? I'm afraid I don't have the answer to that, either. I can tell you that the definition of physical fitness has changed with the advent of automation to refer to whether a person's body operates efficiently at work and leisure. So, do you have any other definitions of physical fitness? I do, actually. It's a state of well-being and health, or basically being able to do your daily activities, work, and sports. What can you tell me on yoga?
Physical fitness is generally achieved through proper nutrition, moderate-vigorous physical exercise, and sufficient rest.