Purpose: This study aimed to examine the effects of weight training on physical self-concept among middle aged women by using a mixed research methods including a single case study design and qualitative study. Methods: A total of 8 middle-aged women from new members of the K fitness center in Incheon participated in the 17 weeks study. The study was structured 2 weeks baseline session, 12 weeks of weight training with observed changes through physical self-description questionnaire (PSDQ; Kim, 2001) and 3 weeks withdrawal session. Results: 12 weeks weight training intervention significantly improved factors of physical self-concept among the participants. Weight training was effective not only in strength and flexibility, but also in sports confidence, physical activity, and endurance. The following is the result of analyzing perceptual changes of the process of physical self-concept change after the in-depth interview with the participants of the weight training. Conclusion: Weight training effectively improved middle-aged women’s physical self-concept including perceptions of health and body, sport confidence, physical fitness and general physical status.

INTRODUCTION
 METHOD
  Participants
  Measures
  Procedure
 RESULTS
  Physical Self-concept
  Physical Self-concept effect size (ES)
  Exercise Change Stage and Body Composition
  Recognition of physical self-concept change byweight training
 DISCUSSION
 REFERENCES

• Do-Hee Jeong(Inha University)
• Byoung-Jun Kim(Inha University)
• Young-Vin Kim(Inha University) Corresponding author