Pelvic Tuck-Lumbar Flattening-L-5 / S-1 Compression Published April 24, 2013 at 375 × 384 in Yoga Injury Prevention-Part 2 Here is a normal (on left) and a posterior tucked (on right) pelvis. Note compression at the L-5/S-1 and L-4/L-5 vertebral joints and disks Continue reading → Showing a normal and a posterior tucked pelvis and lumbar spinal and disk compression. PLEASE SHARE THIS!TweetMorePrintEmailShare on Tumblr