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Lumberjack squats work well when combined with a heel wedge. This might take a few tries to get right. For most the heel wedge would be level with the end of the bar when stationed on the floor. Adjust accordingly though. The heel wedge will increase quadriceps' activity and allow an even greater depth over a variety of foot placements. You can go super narrow to hit the outer quads a bit more (vastus lateralis) or take a wider toes-out stance to hit more of that teardrop (VMO). – Gareth Sapstead
