This study aims to identify the effects of a long and a short interval high intensity training intervention on some physical, physiological variables & shooting efficiency in basketball. Subjects were 20 juniors, well-trained basketball players divided into two experimental groups (SI and LI); players practiced 8 weeks basketball training, the experimental (SI) performed training with short interval high intensity training protocol, and the experimental (LI) performed training with long interval high intensity training for the same eight weeks with 3 sessions per week. The results of this study showed that a long and a short interval high intensity training intervention for eight weeks improves physical and physiological variables (20 Meter Sprint test, Yo-Yo Intermittent Recovery test, (Vo2max), Running Anaerobic Sprint test), and improves the dynamic 60-second three-point shooting test, the stationary two-point shooting test. While no differences between the experimental groups SI and LI. It is recommended to use the proposed training with a long or a short interval high intensity training intervention to improve physical, physiological variables & shooting efficiency in basketball.