Dumbbell sumo squat (aka dumbbell plié squat). A compound lower-body exercise. Target muscle: Gluteus Maximus. Synergistic muscles: Quadriceps (Rectus Femoris, Vastus Lateralis, Vastus Medialis, Vastus Intermedius), Adductor Magnus, and Soleus. Dynamic stabilizers: Hamstrings and Gastrocnemius.

Original article and pictures take http://weighttraining.guide/exercises/dumbbell-sumo-squat/ site