Here’s why arching your lower back slightly hits the hamstrings harder 👇 When you arch: • Your hips tilt back (posterior chain turns on) • The hamstrings get placed under a deeper stretch • You remove momentum and force the muscle to work • Tension stays on the hamstrings instead of the lower back A rounded or neutral spine turns this into a lazy rep. A controlled arch turns it into pure hamstring work. Think: Hips back Glutes tight Hamstrings stretched Slow on the way down Save this tip if you