Eric Janicki IFBB Pro on Instagram: "Sissy Hack vs Stretch-Biased Quad Extension 🔥 (which should you pick?) Both are brutal, both will torch your quads, and both are great options… But if I had to pick just one, the stretch-biased quad extension edges out the sissy hack for most lifters. Why? When you lie back slightly on a quad extension, you create more hip extension, putting the rectus femoris (the only quad muscle that crosses both the hip and knee) under a greater stretch. This means: ✅ Mo