Straight arm pullover - workouts for a firmer bust - IMAGE - Women's Health & Fitness

8. Straight arm pull over

Lie across a stability ball with only your upper back resting on the ball. Place feet flat on the floor with knees in a 90-degree angle. Hold dumbbells together with both hands and hold above your head with straight arms. Keep arms in starting position and lower dumbbells behind, using only your shoulder joint as far as possible. Slowly return to starting position.

Why it works

This isolation exercise focuses on your chest muscles without the help from other major muscle groups. To further challenge your core muscles, put your feet and knees closer together.