Lying straight leg raise. An isolation exercise. Target muscles: Iliopsoas. Synergistic muscles: Tensor Fasciae Latae, Sartorius, Pectineus, Rectus Femoris, Adductor Longus, and Adductor Brevis (deep to adductor longus). Stabilizers (not highlighted): Rectus Abdominis, Internal and External Obliques, and Quadriceps.