The purpose of this study was to investigate the effects of balance training program on grip strength, back strength, isokinetic muscular strength, physical balance, ground reaction force, and shooting scores in rapid fire of high school male athletes. The subjects of this study were randomly assigned into two groups (n=9 in control group; n=9 in balance training group). Athletes in training group performed air-dom and thera-band exercises with moderate intensity for 8 weeks (3 days/week, 90 min/day). The data from this study were analyzed using repeated measures two-way ANOVA. The following results were obtained by analyzing the measurement values between pre- and post-balance training. Grip strength, back strength, isokinetic muscular strength and muscular strength ratio (shoulder, trunk, and knee), physical balance, ground reaction force (of 4 second fires), and shooting scores in the balance training group were significantly different from those in control group. More specifically, the ratio of the flexor and extensor muscle strength on right shoulder joint (p<.05), the left and right ratio of the flexor muscle strength on shoulder joint (p<.01), the left and right ratio of the extensor muscle strength on shoulder joint (p<.05), the left and right ratio of the extensor muscle strength on knee joint (p<.05), the right and left ratio of the extensor muscle endurance on shoulder joint (p<.05), the ratio of the flexor muscle endurance on right shoulder joint (p<.05), and shooting score (p<.05) in the balance training group were significantly improved more than those in control group. Therefore, these findings suggest that the balance training program adopted in this study can be an effective and preventive posture training method for the improvement in the physical balance and muscle strength of rapid fire athletes. Although the balance training program was a safe and appropriate training method for physical balance, future study that considers multi-variable methods such as controlling psychological environment of subject and including more various measurement items for fitness is necessary to delineate and promote further improvements in functional performance in rapid fire athletes.