This study specifically examined the efficacy of relaxation training in significantly reducing the indices of psychological, behavioral, and physiological distress as they relate to anxiety. Also investigated were differential effects of relaxation as a function of both age and gender. Primary outcome variables were aggression, anxiety, impulsivity, hyperactivity, anxiety-related worry, short-term memory, attention span, and physiological indicators of stress. Forty highly anxious adolescents, ages 12--16, were randomly assigned to either the experimental or control condition. Experimental subjects received fifteen 30-minute sessions of relaxation training over an eight week period. The control group did not receive treatment but did participate in pre-test and post-test evaluation. Data analysis at the .05 level or better revealed statistically significant differences between these groups in all primary areas with effect sizes being generally large. However, these findings did not support the influence of the variables age and gender on predicting treatment response. The results of this investigation demonstrated the utility of relaxation training in treating anxiety disorder in youths and the concomitants generally associated with it, irrespective of either age or gender.