Individuals with autism may have associated characteristics that present challenging behaviors (American Psychiatric Association, 1994; Gerdtz, 2000). These behaviors may be self-injurious, aggression, abrupt departure, and property destruction (American Psychiatric Association, 1994).The literature is expanding on the effects of choice making for individuals with disabilities (Powell & Nelson, 1997). The purpose of this study was to investigate the effects of choice making to promote positive behavioral support in a physical activity setting. The subject was a 9-year-old boy with autism. The subject has a fixation for balls; therefore, this was used as a positive reinforcer to decrease his challenging behaviors. This qualitative research study implemented the case study design. The subject°¯s mother, brother, clinic practitioner and clinic director addressed his needs and intervention strategies. The study was conducted in a university clinic for adapted physical activity. The clinic setting consisted of an activity room and swimming pool. The subject was videotaped for twelve sessions, of 40 minutes. Three of the sessions were omitted from data collection due to poor videotaping. The subject was observed to identify the frequency of his challenging behaviors. All other sessions were designated as no-choice and choice. During the five no-choice sessions, the practitioner informed the subject at the beginning of the clinic not to initiate any ball activities. During the four choice sessions, the subject was able to play with any ball at any time but he had to complete a given task by the practitioner or ask permission to play with a ball. The data collection involved descriptive analysis, coding the videotapes, and semi-structured interviews. The clinic director and a certified adapted physical education teacher coded the videotapes independently. Interobserver reliability was ranged from 75% to 100%. The semi-structured interviews revealed that the subject might be hungry which triggers the challenging behaviors. During the coded observation session, the subject had 23 abrupt departures to play with balls or engage in challenging behaviors. The findings of the case study revealed that more challenging behaviors were exhibited in the no-choice sessions than choice sessions, fewer challenging behaviors occurred in the swimming pool than clinic room, and more abrupt departures occurred during no-choice sessions than choice sessions. This study warrants further investigation, it suggests that choice making may enhance the classroom environment to teach physical activity to individuals with autism.Keyword(s): adapted physical activity, curriculum development, physical activity