Effect of Video-Based versus Personalized Instruction on Errors during Elastic Tubing Exercises for Musculoskeletal Pain: A Randomized Controlled Trial

Figure 1

The possible error positions to either side from the ideal position in the horizontal plane of the bilateral shoulder retraction exercise. Pictures show the left side. Negative deviations were denoted by angles below 90 degrees of the joint and positive deviations were applied to angles above 90 degrees.