How to Stretch Rhomboids. Part of the series: LS Stretching & Exercise Techniques. Rhomboids are the muscles between your shoulder blades and they are the place where we tend to get really tight and we hold our stress. Find out how to stretch rhomboids with help from an expert who is widely considered one of the leading health and fitness professionals in the state of Utah in this free video clip. Read more: http://www.livestrong.com/video/10093...