Several studies have demonstrated a significant benefit in pre-procedural ultrasound for epidural placement by anesthesia residents, particularly when performed in the obese population. To the investigators knowledge, however, no studies have evaluated this teaching modality for the lumber epidural technique in the lateral position. Formalizing the educational process for this less frequently performed, highly technical and critical skill may have a profound impact on trainee learning curves, and may enhance the overall success and efficiency of epidural placement, quality of analgesia provided, and safety of the procedure.