Which of the following is NOT included in the Powerhouse?

The Powerhouse is a key concept in Pilates that refers to the core muscles that help stabilize and support the body during movement. This area typically includes the abdominals, inner thighs (adductors), lower back, pelvic floor, and gluteals, as these muscles work together to facilitate effective movement and maintain proper alignment.

The soleus is a muscle located in the lower leg, specifically part of the calf, and plays a role in ankle movement and plantarflexion. While it is important for stability and movement, it does not contribute to the Powerhouse. The muscles in the Powerhouse are primarily focused on the trunk and pelvic region, which are crucial for core strength and maintaining control during Pilates exercises. Therefore, the soleus is not included in the definition of the Powerhouse, making it the correct choice for this question.