The document discusses the lunge exercise and how to perform it. It describes the lunge as an exercise that strengthens the quadriceps, glutes, and hamstrings. It can be performed with a barbell, dumbbells, or cables. The document provides instructions for performing the lunge, including standing with feet shoulder-width apart, taking a step forward and lowering into a lunge position until the front knee forms a 90-degree angle, then pushing back to the starting position.