Do some ATG low bar squats. The hamstrings are the biceps, and the quads are the triceps of the lower body. I used to hate leg day. I still did em out of necessity, but it somewhat showed. Now that I fixed my form, really focused on the eccentric and concentrics, and did a deload and stopped ego lifting like 90% of people I see on squats, all my other main lifts have skyrocketed, and I started throwing on massive amounts of mass again like newbie gains. That CNS stimulation and release of testosterone from proper heavy squats is a game changer