Stepping out to the side loads one hip in a different direction from a forward lunge. It asks the glutes and adductors to share the work.

Diagrams show the shape of the movement. Follow the written steps before you add load.
Equipment. Bodyweight
Muscles. gluteus maximus, adductors. Also quadriceps, gluteus medius
All Cheeked Up publishes general fitness education. It is not medical advice, physical therapy, or a promise that your body will change. Stop any exercise that causes pain and talk with a qualified professional about injuries, pregnancy, or health conditions before you train.