Grade II (moderate): A larger tear in your muscle that makes it difficult to move and causes a moderate amount of pain, especially when you move the affected muscle, swelling, and tenderness. You may have 5 percent to 50 percent loss of function and you may be limping. You can't go back to sporting activities until the tear is completely healed. These injuries can take anywhere from a couple weeks to a few months to heal, depending on how bad they are.
Acute back pain is often the result of muscle sprains or strains. Sprains occur when your ligaments are overstretched and sometimes torn. Strains, on the other hand, are caused by stretching — and possible tearing — of your tendons or muscles. Though the immediate reaction is pain in your back, you may also experience dull aches or discomfort in your hip.
Transitioning between these two poses will stretch your entire back, as well as your hips, core, chest, and neck. Start on your hands and knees with your shoulders directly above your hands and your hips directly above your knees. Spread your fingers and press your palms into the floor. As you breathe in, arch your back, lift your tailbone and head, and look toward the ceiling or sky. As you exhale, round your back and tuck your tailbone, tucking your chin against your chest as you shift your gaze to between your knees. Oscillate between these two poses for 10-15 breaths.
I think you should mention that for some people, stretching is not the solution and that it will deteriorate their posture. Some people need stretching, but most people I know need to strengthen their "overstretched" hip flexors. Many people can't do a single hanging leg raise. Check this site if you want to know more about the importance of hip flexors ********** www.smarterpage.wixsite.com/unlock-
Grade III (severe): A complete tear in your muscle that causes severe pain and swelling and you can't bear weight on that leg, making it difficult to walk. You've also lost more than 50 percent of your muscle function. These injuries are less common and may need surgery to repair the torn muscle. They can take several months or more to completely heal.