A split stance with a hand on a wall lets you train one leg without a rear foot on a bench. It is the on-ramp to reverse lunges and Bulgarian split squats.

Diagrams show the shape of the movement. Follow the written steps before you add load.
Equipment. Chair
Muscles. quadriceps, gluteus maximus. Also 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.