Plank

Abs Plural, a series of muscles also known as “The core” from hips to shoulders. The abs and core allow movement through parts of the body while stabilizing and minimizing movements to others. This benefits ideal alignment and spine posture throughout the swing, while also giving the ability to transfer power from the lower body, through the midsection, and into the arms and club

Starting position:

In a prone position, your weight is supported on your toes and your forearms alone.

Make sure your body is straight the entire time, and make sure to contract the abs to help support your weight. Hold as long as desired.