One reason (not to say I've done it myself) is that it makes you feel good.
Explanation:
Physiological principles: it is a low impact activity, as well as canoeing. It can significantly improve one’s aerobic fitness, strength and flexibility. Some of the health benefits: improved cardiovascular system, muscular strength and others.
Bio mechanical principles: it is a typical speed competitive event. It’s usually based on technique and strength. Experts say that after a few years, they have not noticed any big differences.
Diffusion.
diffusion is passive, and the oxygen and carbon dioxide move to the area of lower concentration
when a young male or female gets to the age where there bodies start maturing and growimg up
I chew on ice if its not that bad it works fro me but try diy ways
