Plank with Twist
Main muscle: Abs
Equipment: no equipment
Mechanics type: compound
Fitness level: beginner
Category: Increase strength

  1. This is an important abdominal exercise. Get into a prone position on the floor, supporting your weight on your toes and your forearms. Your arms are bent and directly below the shoulder.
  2. Keep your body straight at all times. Pivot to one side, raising that arm vertically above you as you twist.
  3. Pause and return to the starting position, and then repeat on the other side.

Source: bodybuilding.com