I love split squats as a lower body exercise. Typically you would start with the rear foot on the ground, but, as players progress and get stronger the rear foot elevated version is required. The problem with this exercise is;
a) Bench heights can be too high to make this exercise safe and comfortable. Foot cramps and Big toe pain is common.
b) Split squats stands are super, but they are expensive and can be hard to get.
I played around with this option when I was coaching the Offaly Senior footballers some years ago and it worked out great.
Simply get a hollow padded foam roller, a red super band and loop it in the middle and fasten it to the head of the bench as shown. Be sure to have the band tight so the roller doesn’t wobble.