The core muscles can be categorized as stabilizers or mobilizers. Stabilizers like the transversus abdominis and multifidus are deeply placed, have slow twitch fibers, and help provide stability. Mobilizers like the rectus abdominis are more superficial and have fast twitch fibers for movement. Chronic low back pain is associated with weakness in the transversus abdominis and multifidus as well as decreased flexibility. A core strengthening program focuses on training these local stabilizer muscles in three stages: 1) local segmental control, 2) closed chain exercises, and 3) open chain exercises and functional progression. Exercises target the transversus abdominis, multifidus, and glute