Walking lunges ask the legs to balance, not only to push

A squat trains both legs together. A walking lunge splits the work. You step forward, lower the back knee toward the floor, and then drive through the front foot to the next step. The torso stays tall. The front knee stays over the ankle instead of shooting far past the toes.

People feel this in the front thigh and the glute of the front leg, and they also feel it in their balance. One side is usually cleaner than the other. That is useful information, not a reason to quit. Shorter steps and lighter dumbbells fix a messy lunge faster than forcing a long stride.

Count steps, or count pairs of steps, and write the same unit every time. FitActive includes the walking lunge in the basic workout because it needs almost no equipment and still progresses: more steps, then dumbbells, then a slower lowering.