Hello to the GB community from Zagreb, Croatia. Yesterday my friend was doing an iron-cross on aerial straps and got himself a sternal fracture. He was supported with the straps around his elbows so it wasn't a full position. In addition, his chest was out, his scapulae elevated and his grip rotated (palms upwards). Now he cannot lift his arms nor rotate his head and he has difficulty breathing. His connective tissue and muscles clearly weren't ready for IC work, but I am interested what do you think - could the fracture happen solely because of this 3sec hold or something else preceded that? Btw, can breathing/not breathing be a factor during this? Last thing, it would be great to include injuries/rehab forum, if it doesn't already exist.