What body parts are used to extend the hip when climbing stairs?

The body parts involved in hip extension when climbing stairs are the torso and lower back, opposite leg, knee and ankle, and hip joints. Hip extension during stair climbing occurs when the opposite leg is raised to the next step.

The hip extension is accompanied by knee and hip flexion in the opposite leg and involves several muscle groups. In the opposite leg, hip flexors, tensor fasciae latae and pectineus are involved, while the most prominent muscle of hip extension in the leg supporting the movement is the gluteus maximus muscle. It is the largest muscle of the posterior, giving it its curved shape. Gluteus maximus is also active during rotation of the hip.