Answer and explanation:
Heart disease is the number one cause of death in the developed countries and, although it can be treated, it has no cure so it's very important to prevent the development of this life-threatening condition. Both the prevention and the treatment of heart disease include: having a healthy diet, exercising, avoiding smoking, and controlling one's weight.
There are many practical ways in which a group of young people could raise awareness about heart disease, like for example 1) giving a speech in a public space in which they talk about this condition and how to prevent it, or 2) learning CPR (cardiopulmonary resuscitation).
The first point is very important to raise awareness. Many people underestimate the damage they do to their bodies when overeating or smoking, for example, so a public speech given by charismatic and well-informed people could be very eye-opening to some. To cause an even bigger impact, the orators could mention cases of heart disease in their relatives or their acquaintances.
The second point can be vital to saving lives. Cardiopulmonary resuscitation is a skill that everyone should learn, because you never know when you might need it. If a group of young people at school would gather to learn and teach CPR, they would gain knowledge that could potentially save someone's life, and raise awareness as well about the importance of knowing this important technique.