We performed thoracic extension on the foam roller in our movement principles class and one of our clients asked if our abs should be on during it.🤔 Short answer--it depends on the spine and the human! The goal of this mobility drill is to use the roller to self-mobilize the thoracic spine into extension and incorporate movement to get us out of the rounded posture we tend to live in. If when you lean back over the roller, the low back curves into extension excessively, then you're no longer ta