Answer:
entropion
Explanation:
Entropion is a condition in which your eyelid, usually the lower one, is turned inward so that your eyelashes rub against your eyeball, causing discomfort. Entropion is a condition in which your eyelid turns inward so that your eyelashes and skin rub against the eye surface.
The correct answer should be gymnastics. While the other mentioned sports could help him too, gymnastics is the most comprehensive one because it involves almost every muscle in the body to do various exercises, whereas biking would increase his leg muscle fitness most, but would not do much for the rest of his body.
You could be considered to have an ameia disease. There are many different types. One can help malaria grow called hemmoragic anemia.
The answer would be carbohydrates