Hip Flexors

The hip flexors comprise 4 major muscle groups:

1. Iliopsoas
2. Rectus Femoris
3. Tensor Fascia Lata
4. Sartorius (longest muscle in the body)

Secondary flexors are the pectineus, adductor longus, adductor magnus, and gracilis muscles (Yessis, 1992). Per source, these secondary flexors contribute to hip flexion only to between 40 and 50 degrees. Training exercises listed for the hip flexors are hip flexions and reverse crunches.

• 4 primary hip flexors: iliopsoas, rectus femoris, tensor fascia lata, sartorius.
• Secondary flexors: pectineus, adductor longus, adductor magnus, gracilis.
• Secondary flexors contribute only to between 40–50° of hip flexion.
• Exercises: hip flexions, reverse crunches.

• iliopsoas — primary hip flexor.
• rectus-femoris — 2-joint hip flexor / knee extensor.
• tensor-fascia-lata — hip flexor / abductor / medial rotator.
• sartorius — longest muscle; hip flexor.
• hip-flexion / reverse-crunch — training exercises.