The underside twist on the bench is a beginner level core exercise that targets the obliques.
The bench side plank hip raise is a beginner level core exercise that targets the obliques and abs.
The single side seated trunk twist is an intermediate core exercise. This exercise helps to tone and strengthen the entire mid-section and is suitable for intermediate to advanced fitness levels.
The four point superman on the bench is an intermediate core exercise. This exercise requires a great amount of core strength and stability to be done properly.