Magical numbers for repeats.

Am enjoyed aerobic and shaping, and am used are exercises for 8-16 times,and why?
As on begin though ,that repeats numbers as tied with a musical rhythm, which calculating by 8, and exercises doing with music, and later,found,that force exercises doing are 8 times and without a music. And they are right a rising maximal weight ,that muscles growing for, and in japan, china gymnastic as and breath is same. As this explains,that 8 looks,like by a west peoples,like a sign for without ending,and these are consciences,and here is also by a science evidences,and in such quantities repeats are rising a natural rhythm's of blood circulation and lymph outflow and maximal improving metabolism processes in tissues,that leading to organism recovering.And any massage and exercises moves am doing til 8 times or a numbers of quantities repeats is mist to be without a balance and divides is on the 8, as for example are 16, 24,32.