The long arm crunch is a modified version of the tradition abdominal crunch. When the arms are extended above the head, it increases the level of resistance placed on the abs . Thus, the traditional ab crunch becomes a bit harder to perform.
Why are long arm crunches hard?
The long arm crunch is a modified version of the tradition abdominal crunch. When the arms are extended above the head, it increases the level of resistance placed on the abs . Thus, the traditional ab crunch becomes a bit harder to perform.