I'm not an expert, but I was able to help in this. I have deleted some unnecessary letters and prepositions. I put my corrections in red where I have replaced your own words.
Physical fitness is crucial for a human being. Unlike other living creatures, humans use physical and mental entity to survive. In fact, a healthy physical and mental condition is a prerequisite for human beings. A man not only ingests food to live, but also to pursue physical exercises which is essential for physical endurance.
Physiology of exercise has been brought many scientifically proven benefits from exercise. Firstly, it assists to manage weight. Regular exercise elevates the bulk of protein, carbohydrate and fat which proliferates with different foods (didn't get the meaning). Secondly, it endures circulatory efficiency. Lastly, it stimulates psychological impacts on a person. S/he becomes relax physically and spiritually.