Strained muscle: Overstretching or tearing of muscle fibers due to excessive usage or unexpected activities
https://www.tumblr.com/albiusnruw/750023383313416192/factors-that-determine-mistake-in-an-auto-mishap
Strained muscular tissue: Overstretching or tearing of muscle fibers because of extreme use or unexpected movements, causing discomfort and weakness