Back Flexion & Extension Stretch; Kneeling Back Flexion & Extension Stretch; Kneeling Abdominal & Obliques Muscle Stretches, Common Stretches & Advice, Gluteal Muscle Stretches, Lower Back Stretches, Mid-Back Stretches Back Flexion & Extension Stretch; Kneeling Muscles: Transversus Abdominis, Gluteus Maximus, Rectus Abdominis & Erector Spinae [...] Back Flexion & Extension Stretch; Kneelingconnor2014-03-06T17:10:26+00:00