You won’t be able to start exercising for more than a couple of weeks without coming across the lunge. It’s a fantastic move that works your quads, glutes, hamstrings and calves, while also challenging your stability and coordination, so it—or its more common relative, the reverse lunge, which can be gentler on your knees—is well worth mastering.
But you shouldn’t stop there. After a while, your body will adapt to the demand the lunge places on it. If you keep doing the same movement the same number of times, you’ll get minimal benefit from it.