How to: Barbell Lateral Lunge / Side Lunge Barbell Lateral Lunge Benefits Barbell lateral lunges develop balance, stability, and strength. They work your inner and outer thighs and may even help to reduce the appearance of cellulite. Muscles Worked in the Barbell Lateral Lunge Target - Gluteus MaximusSynergists - Quadriceps Synergists - Adductor MagnusSynergists - SoleusDynamic Stabilizers - HamstringsDynamic Stabilizers - GastrocnemiusStabilizers - Erector Spinae Stabilizers - Gluteus MediusStabilizers - Gluteus MinimusStabilizers - Quadratus LumborumStabilizers - ObliquesStabilizers - Tibialis Anterior