A linear growth depends on both genetic and environmental factors that alter growth and sexual maturation. Exercise and nutrition are main environmental factors to alter linear growth and sex maturation. The effect of these factors has been well documented in a variety of elite sports, but there is limited information on regular exerciser who works out at a recreational level. To investigate the effect of exercise on linear growth in adolescent boys, the association of predicted adult height (PAH), target height (TH), pubertal stage and skeletal age, and physical activity(basketball) were evaluated in 51 adolescent boys out of 2,810, aged 15yr. 51 boys were automatically divided into two groups by participant characteristics: basketball group (n=22:, ≥3times/week, ≥30min/session) and inactivity group(n=26, ≤2times/week, ≤30min/session). The study included assessment of height, weight, sexual development, body fat, skeletal age, and dietary intake. Basketball group took more daily energy intake than inactivity group(p<.01), with relatively similar percentages of carbohydrate(68.93%), fat(13.47%) and protein(17.6%). There were no statistical differences in height, TH, skeletal age, sexual development between groups while there was a difference in PAH between Basketball group (178.27㎝) and Inactivity group C(174.75㎝, p<.05). This result indicated that regular basketball exercise at the level of recreation (4.57±.27)/week, 70±6.65/session) can favorably influence on linear growth in adolescent boys by increasing energy intake.