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One of the correct ways of selecting and directing the youth toward the right athletic activity is assessing their inherited physical and motor characteristhics. The
Scope of this study was to compare the physical characteristics (height, weight and max heart rate), physical fitness factors (max aerobic capacity, flexibility, obdominal
muscle endurance and grip strenght), motor fitness factors (Speed, agility and auditory response time), among 16 pairs of identical twin sisters (Experimental
group), and 18 pairs of non - identical twin sisters (Control group), from the city of Rashet with an age ranse of 14-17 years.
Both contort and experimental groups were selected randomty and non ¬randomly based on specific criteria such as being monzygot (MZ) or not under the
supervision of a specialist. All Variables were investigated under similar condition, using stadart and common fidld tests. The hypothesis of this study was also
investigated by using pearson coefficient correlation, dependent and independent (t) test with (a = 0/05) , using Spss program