This quasi-experimental study compared the effectiveness of the Wellness Model of Supervision (WELMS; Lenz & Smith, 2010) with alternative supervision models for developing wellness constructs, total personal wellness, and helping skills among counselors-in-training. Participants were 32 master's-level counseling students completing their internship requirements in a counseling program accredited by the Council for Accreditation of Counseling and Related Educational Programs. Results of a split plot analysis of variance indicated that participants in the WELMS condition increased their personal definitions of wellness and total wellness while developing their counseling skills at a similar level when compared with participants receiving other models of supervision.