Maintain an equal weight distribution between the front of the foot and the heel. Hip and ankle flexibility are important to the proficiency and safety of this workout. It is recommended to inhale as you squat and exhale as you stand up.CrunchAnother very good and popular exercise for the core, especially the abs and obliques.Preparation: Lie on your back, i.e. back on the floor. Place your hands behind your neck or head. Bend your knees and plant your feet on the ground. Execution: Bend your waist to lift your upper back off the floor. Keep your lower back in contact with the ground and lift your upper torso as much as possible. Then lower yourself again until the back of your shoulders touches the floor. Repeat for the desired number of repetitions. Note: Some people may need to keep their neck in a neutral position by maintaining a space between their chin and sternum. You can make the exercise easier by placing your arms in front of your head or more difficult with your arms behind your head.T