For about 40 years the term “core muscles” has been a part of our culture. But most people think only abs qualify. This is incorrect. Not only do core muscles include the 3 abdominal layers, but they refer to any muscle that attaches to the pelvis. 
Which includes back muscles, the glutes, the hamstrings, quads, inner and outer thigh muscles, etc. Even though “core muscles” is not an official anatomical term, it is a useful concept which describes the muscles that have the following functions:
1. control our center of gravity
2. connects our lower body to the upper limbs during physical tasks requiring full body motion
3. allow an anchor for leg muscles to perform their function Continue reading
I started rehabilitating the knee and cautiously grappled. Within a month I worsened the injury while grappling. Unfortunately, the next day, I was scheduled to run the Tough Mudder at Whistler in British Columbia. I taped my leg up like a mummy and ran the 16 K trek up and down the world famous ski resort. About one and a half months after this, while grappling, I dislocated the medial meniscus and it shot out the back of the knee joint. Not having x-ray vision, I did not exactly know this at the time, but a later MRI revealed it. Finally, at that point I stopped grappling completely and turned simply to rehabilitation while I await surgery. 
