Hello, I'm Pafik's three-star personal trainer! Let me tell you what iliopsoas muscle is first. Ilipsoas muscle consists of iliopsoas muscle and psoas major muscle. Iliac muscle is fan-shaped and starts from iliac fossa; The psoas major muscle is long, starting from the lateral surface and transverse process of the lumbar spine. The two downward muscles meet, pass through the deep surface of inguinal ligament and stop at the femoral trochanter. Doing hip lifting exercises can exercise iliopsoas muscles, such as leg lifting and sit-ups, but don't deliberately train this muscle, because this muscle is too developed, which will lead to the pelvis leaning forward! I hope I can help you.