The answer is:
Age
This is because if your young your organs are not as developed. When your older your body handles more because it is developed fully.
There are 5 groups in the vertebral column. In order they are called
1) Cervical
2) Thoracic
3) Lumbar
4) Sacrum
5) Coccyx
The 4th group contain 5 bones and once you are in the adult phase,
roughly at about 26 years, the 5 bones fuses into one bone which shrink
the number of bones the vertebra column have but but does not lose in
size.
not a 100 % sure hope this helps
1. stroke
2. heart attack
3. lung infection
4. cancer
5. heart attack
6. stroke
7. stroke
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.