^ I beg to differ. There has been people who've ran it at 7.5 minutes and under. Most male peers in my class passed it less than 8.5 minutes. About half of that said population passed it under 7.5 minutes. From my days, 10 minutes+ is kind of too long it usually signifies that either exercise is needed, the person is lacking effort or there's a physical disability present in the said person from my view of the runners.
There has been people whom attain a time of 10+ minutes from both males and females back in my days too, but this was maybe 15% of the class and we had about 65 people in my class. From my opinion, I would worry if walking for 15 minutes or running for more than 5 minutes is a problem as in you're already struggling to continue the exercise or can't keep a conversation while walking or running.
Lack of exercise effects your entire body. These are a few examples:
- Muscles loses its shape, tone and strength.
- Joints lose blood-oxygen supply and decreases your flexibility. Bone's density and strength worsens due to lack of movement and can lead to osteoporosis.
- The gastrointestinal system (digestive system) loses tract tone and increase constipation can occur.
- Your blood vessels loses its muscular strength to contract thus decreases your blood-oxygen supply throughout your body and wears out your heart by pumping more blood.
- Decrease of blood flow creates ineffective urinary excretion and stasis or stagnation of urine can happen.
I wouldn't really about the time though. What matters is if you're doing anything to improve it.