MORE NEW and UNIQUE STUFF! HAMSTRING FOCUS (while not technically "CORE" - they have a huge impact on the spine. The hamstrings are notoriously TIGHT plus WEAK on all bodies. Overall, commonly, our quadriceps front leg are up to 4x stronger than the hammies (back of leg) on the same body. Yikes. Plus they are tight. It's a bad combo. Luanne shared that in graduate school she heard of a research study with NFL players to strengthen hammies for the express intent of reducing tears and injuries. It's pervasive how important this work is. Used: 2 blocks, blanket.