The neck ismedialto the arms?

The neck is the start of the spinal column and spinal cord. The spinal column contains about two dozen, oddly shaped, bony segments, called vertebrae. The neck contains seven of these, known as the cervical vertebrae. They are the smallest and uppermost vertebrae in the body.

Explanation:

sana makatulong ako sayo

at ano ba ang grade mo

I would say that the answer is -perform very short segments of high intensity activity

From my own personal experience in cross country, you want to always perform short bursts of activity. You don't want to work above your target heart rate because that is just asking for trouble. You can always run if that's what you can maintain, but most people can't. Keeping one foot on the floor is a bad idea because you will not be able to go as fast that way.