A well-rounded program requires balance between muscle groups and incorporates all our movement patterns. Your workout also needs to balance pulling motions (e.g., a row, bicep curl, lat pull-down) with pushing motions (e.g., push-up, chest press, overhead press). Leg exercises occupy their own category, beyond push or pull, because most incorporate both the anterior (front) and posterior (back) muscles synergistically, unless specific muscles are isolated on a machine.
