"Split squats" refer to an exercise where one foot is positioned in front, and the other foot is positioned behind. It involves bending the knees and lowering the body down, similar to a lunge. Full definition
One way to really challenge your glutes, and your core, is with this elevated split squat with an added rotation in the opposite direction. (verywellfit.com)
In contrast, the rear foot elevated split squat appears to produce greater calf muscle activity than the back squat. (strengthandconditioningresearch.com)