<p style="text-align: justify / " class="Default">In developing economies and specifically Sub-Saharan Africa physical inactivity has been identified as a risk factor along with tobacco use, poor nutrition and poor diet as this has increasingly formed part of today&rsquo / s lifestyle. Physical activity declines with age this decline is more marked during the adolescent period. The aim of this study was to determine the prevalence of physical inactivity and factors associated with it among adolescents in <st1:place><st1:city>Nairobi</st1:city>, <st1:country-region>Kenya</st1:country-region></st1:place>. The overall aim of the study is to determine the factors influencing their levels of physical activity in relation to their socio-economic characteristics. <o:p></o:p></p>

<p style="text-align: justify / " class="Default">In developing economies and specifically Sub-Saharan Africa physical inactivity has been identified as a risk factor along with tobacco use, poor nutrition and poor diet as this has increasingly formed part of today&rsquo / s lifestyle. Physical activity declines with age this decline is more marked during the adolescent period. The aim of this study was to determine the prevalence of physical inactivity and factors associated with it among adolescents in <st1:place><st1:city>Nairobi</st1:city>, <st1:country-region>Kenya</st1:country-region></st1:place>. The overall aim of the study is to determine the factors influencing their levels of physical activity in relation to their socio-economic characteristics. <o:p></o:p></p>