"Overactive muscles" refers to muscles that are working too hard or contracting too strongly, even when they are not needed. This can lead to tension, pain, and decreased flexibility in those muscles. Full definition
Foam rolling was introduced by physical therapists for patients and strength and conditioning coaches to help athletes inhibit overactive muscles. (drhipandknee.com)
At the very least though this presentation his reaffirmed the need for me to focus on good breathing mechanics in my athletes, to understand the role of the thoracic spine on multiple other joints throughout the body, and to emphasise inhibition of overactive muscles rather than activation of inhibited muscles in the pursuit of better joint mobility and stability. (rugbystrengthcoach.com)
Botox blocks chemical changes on nerve endings and relaxes overactive muscles. (holtorfmed.com)