I have heard that when doing deadlifts and person should keep their elbow straight so that they don't tear their bicep muscle. What about when doing heavy swings? In some of the directions for swings I have read it is stated that a slight elbow bend is allowable. I usually keep mine straight. One time when I was practicing I was attempting to delay my hinge until my arms were closer to my body. I think in the effort to do this I started bending my elbow and pulling the kettlebell into my body to some degree. I felt a pulling or strain in one of my arm muscles. I think it was the forearm muscle next to the bicep muscle. When I straightened my elbow it went away but I noticed a mild discomfort in the area. I guess it could have been the bicep muscles but I think it was the brachialis. I am not an expert in anatomy so I can't be sure. After it happened I wondered if I might have been close to a serious injury. Also, I did start adding snatches to my routine lately and it seems like there was some extra stress on my arm muscles. This was the first time I ever felt anything like that. I am very cautious about avoiding injuries.