“In the past, before the physiology of abdominal training was well understood, bodybuilders used to do a lot of “conventional” abdominal exercises such as Sit-Ups and Leg Raises. Unfortunately, those are not primary abdominal exercises but instead work the iliopsoas muscles – the hip flexors.”

“In the past, before the physiology of abdominal training was well understood, bodybuilders used to do a lot of “conventional” abdominal exercises such as Sit-Ups and Leg Raises. Unfortunately, those are not primary abdominal exercises but instead work the iliopsoas muscles – the hip flexors.”

— Arnold Schwarzenegger