the aim of this research is to examine the relationship between the Body Mass Index, leg power, speed, and cardiorespiratory fitness among adolescents living in Bangka Belitung Islands. 105 adolescents with an average age of 18 years were randomly selected from senior high school graduates. These adolescents where made to undertake a physical examination at the Physical Education Health and Recreation Department of the Teacher Training and Education of Muhammadiyah Bangka Belitung. The measured variables were the height, body mass, vertical jump (leg power), speed (60 meters), and 1000-1200 meters run/walk (cardiorespiratory fitness). Results obtained showed BMI to be significantly correlated with a leg power value of t = 4.97, and p < 0.05, a speed value of t = 4.04, and p < 0.05. The results also proved that the CRF was not significantly correlated with BMI which had a t value of 0.30, p > 0.05; leg power value of t = 0.71, p >0.05; and a speed of t = 1.12 in which its p is greater than 0.05. Adolescent's leg power was average, but their speed was fair, and the CRF was poor. From the results obtained, the various variables associated need to be given attention and enhanced especially speed and CRF in order to develop a fit adolescent.