This school-based study analyzed the impact of RGI on lung functioning (forced expiratory volume in 1 s [FEV[subscript 1]] and forced expiratory flow 25-75 [FEF[subscript 25-75]]) and by employing a multiple baseline design across 3 high school students with asthma and clinically diagnosed anxiety disorders. The RGI intervention took place for a 20-min period, an average of three times per week, over a 4-week period. At the onset of the intervention, it was found that lung functioning, particularly FEV[subscript 1] increased in all 3 participants, with effect sizes ranging from -0.32 to -2.48. FEF[subscript 25-75] improved in one of the participants. In addition, a positive impact was also seen in the lowering of anxiety scores across all 3 participants, with effect sizes ranging from 0.12 to 1.69. (Contains 4 tables and 3 figures.)