If you are an adult, or a senior citizen (like me), you have to be careful about sitting for prolonged periods of time (e.g. traveling by car or airplane), since blood clots can form in your legs. If one of these clots breaks off, it can block up blood vessels in your lungs which will cause severe difficulty in breathing and in some cases (sadly) sudden death.
The linked article from the Journal of the American Medical Association is useful information intended for patients. Please follow these easy steps to avoid a catastrophe which takes away so many lives each year.
View post from The Journal of the American Medical Association