The squat is the king of lower body exercises. This movement will train the quadriceps, adductors, glutes, hamstrings, lower back / spinal erectors, and core.
The deadlift trains more muscle groups than any other exercise that we know of. It trains the posterior chain which includes hamstrings, glutes, and spinal erectors.
The bench press allows you to lift the heaviest amount of weight with your upper body. It trains the chest, the anterior shoulders, the triceps, and muscles in the lower body if done correctly.