Physical - risk taking activities can be classified along a continuum ranging from prosociality to antisociality. The present study was aimed at identifying the personality factors from Zuckerman's alternative five model common to those who engage in physical risky activities, and those that differentiate among the groups along the continuum. The sample consisted of 89 prosocial risk takers - policemen preparing for the pace keeping mission in Kosovo (for example: antiterrorists, pyrotechnics, detectives from Central Bureau of Investigation (Polish FBI) and 75 antisocial risk takers incarcerated for having committed armed robbery. Subjects were administered the Zuckerman-Kuhlman Personality Questionnaire - ZKQP. The two variables that best discriminate among the prosocial and antisocial risk takers are: Sociability and Aggression- Hostility.