Viagra is not a steroid. It is a simple compound with a complex function. It started of as a cure for penile erectile issues. It achieved a solution through the mixing of nitric oxide into blood.  This helps relax blood vessels and increase blood flow. This was fundamentally useful for solving erection issues.

However the same Viagra actually relaxes most blood vessels in the human body. This causes proper blood flow to parts of the body such as the lungs. Athletes today use this to their advantage in their workouts. The ease of blood flow is useful to the athlete’s endurance through a workout session.