This is false, because they do provide calories (actually a lot), but do not have nutritional value. They are "empty" in nutrients, hence the name "empty calories."
Lying quad stretches are effective static stretches for runners because they lower muscle temperature after a workout. This type of stretch is commonly used for runners because they warm up and cool down the leg muscle. Runners from the word run, they mainly use the legs for it. So they need a type of exercise that would enhance their leg muscle.
