Hello, I am 20 years old male. I do exercises often. Like pull up, push up, squat, crunch and lifting. Recently i tried jump rope for cardio. After week of jump rope i have weird chest pain that i never felt before. More specifically under part of my chest. It hurts when i start jump sometimes breath deep. Not that serious pain but really uncomfortable. It hurts not deep in chest nor the outside skin. But more to the outside like a under skin. Is this pain normal? Thank you.