Barbell squat. Arguably the king of all compound exercises! Use it to build your legs and glutes, strengthen your core, and develop body-wide strength and power! Target muscles: Gluteus Maximus and Quadriceps. Synergists: Adductor Magnus and Soleus. Dynamic stabilizers (not highlighted): Hamstrings and Gastrocnemius. Numerous other muscles, all over the body, act as stabilizers. Note: I only highlight targets and synergists.