Tears are made as a protective barrier for you eyes when tears flow it "washes" out any bad material or infectious item within the eye
Day-to-day tasks can quickly become difficult with poor aerobic capacity.
Your body will fatigue much quicker because of the lack of oxygen able to circulate through your muscles.
Things such as running, swimming, and rock climbing will become difficult. However, so will things as simple as cleaning the house, walking the dog, and playing with your children.
Iron supplements may be used in treating anemia and is
commonly used by athletes. However, the kind of anemia that athletes experience
is a little different because it tends to be exercise-induced due to their
heavy training. In this case, iron may be ineffective in raising hemoglobin
concentrations because of the exercise-induced decrease in iron absorption.
This is kind of an personal opinion.