Contralateral Rear Foot Elevated Split Squat (RFESS)
One of my favorite split squat variations is the contralateral rear foot elevated split squat. The position of the dumbbell requires even more stabilization from the external obliques and hip complex, so it doubles as a great way to train single leg strength and stability.
With more hamstring, glute med and oblique activity and similar abdominal/erector spinae activity, split squats are a nice alternative to back squats as a hip extension exercise. Grab a heavy dumbbell and enjoy.