This was a randomized controlled trial with random assignment of eligible full-time Korean–
Chinese female migrant workers to a stretching exercise intervention (n = 40) or an enhanced stretching
exercise intervention (n = 40) condition. Both conditions received a 6 min stretching exercise program that
included an orientation and three work-related musculoskeletal disorder (WMSD) educational classes.
Between educational classes, the enhanced stretching exercise condition also received mobile phone text
messaging and telephone counseling to increase self-efficacy (confidence in overcoming barriers) and provide
social support. Flexibility, muscle strength, musculoskeletal symptoms, and acculturative stress were
assessed at baseline and 12 weeks.