Hey,
I've been looking for a 4 day upper/lower split for a while now as 2x a week bodypart frequency appeals to me as a good mix between allowing frequency/volume and recovery.
Monday
Lower
3x8 Squats 60kg
3x8 RDL 50kg
2x10 Leg Press 120kg
2x10 Leg Curl 56kg
3x6 Standing calf raise 80kg
2x10 seated calf raise 40kg
Abs
My knees don't move forward very much at all btw. I tried today to keep a neutral spine, high bar with knees forced out. It felt stronger than it has but still work to do when squatting.