Provide the letter for the spinal muscle group that is best…

Provide the letter for the spinal muscle group that is best targeted by each of the following strength exercises (choose a letter a, b, c, or d for each blank). 1. Side reach  _____ 2. Curl-back (with arms low to high fifth) ______ 3. Hip lift (with band) _______ 4. Sitting spine twist ______ 5. Prone single-arm spine arch  _______ a. spinal flexors b. spinal extensors c. spinal lateral flexors d. spinal rotators