On this trainer, you definitely won't be skipping leg day. Chest, bis, and tris might be your show muscles, but strong, stately legs are definitely an essential part of the "go" component of a body that has show and go. Without substantial training, your wheels will go flat—and nobody wants to see that.
Because front squats are front loaded as their name suggests, you'll be in a more upright position as you squat. Staying in an upright position will place more emphasis on your quads. The back squat hits your quads too, but because it's a more hip-dominant movement, you'll also hit your glutes and hamstrings. Both of these lifts will help you build that strong, well-rounded physique.