3. Squats

Which muscles are trained: When you do squats, you train your quadriceps, glutes, hamstrings, and your whole posterior chain.

How it’s done: Start standing with your feet shoulder-width apart, or wider if you feel unstable. Lengthen your spine, bend your knees, and reach your hips back, as if you’re sitting in a chair. Come back to standing with an exhale and repeat the exercise.