ACE Group Fitness Instructor Practice Exam

Which primary muscles facilitate hip flexion?

1. Quadriceps and Hamstrings

2. Psoas, Rectus Femoris, Sartorius, and TFL

3. Gluteus Maximus and Adductors

4. Rectus Abdominis and Erector Spinae

The correct answer is: Psoas, Rectus Femoris, Sartorius, and TFL

Hip flexion is primarily facilitated by a group of muscles that work to lift the thigh toward the torso. The psoas major is one of the most important hip flexors, as it connects the lumbar spine to the femur and is vital for raising the leg. The rectus femoris, which is part of the quadriceps group, also contributes to hip flexion in addition to its role in knee extension. The sartorius, the longest muscle in the body, assists in flexing, abducting, and laterally rotating the hip. Finally, the tensor fasciae latae (TFL) plays a supporting role in hip flexion, particularly in activities involving stabilization of the pelvis. The combination of these muscles allows for effective movement during activities like running, kicking, and climbing, making them essential for hip flexion.