Oxygen by itself does not contain usable energy, however, it {days a major role in releasing the energy stored in previously ingested food. The energy demands of your contracting muscles increase during exercise, as does their need for oxygen Because the air you breathe consists of only 21 percent oxygen, you need to inhale an increased volume of air and oxygen to meet your body's needs. You will know if you are nor breathing correctly through each repetition because you will be out of breath by the end of the exercise.
Exhale through your mouth in a controlled manner during the most strenuous part of the movement For example, when you are performing the biceps curt, exhale as you lift your arms to contract your muscles I * Inhale through your nose during the easier part of the exercise When working your biceps, inhale as you lengthen your muscles to return to the starting position. Be sure there is adequate ventilation during your workout Excessive yawning can result from the fresh air.
Your abdominal muscles are actually a group of six muscles that originate on the sternum and ribs and extend to areas of your pelvis. They assist with your movement, breathing process, and posture. Your abdominal muscles shorten and your back muscles lengthen to move your shoulders forward toward your hips. The reverse action creates backward flexion. The muscles that are deeper and closer to your spine contribute the most structural
support.
While your abdominal muscles can't be separated (they all work together in each exercise), there are exercises that favor certain portions of the abs. It's helpful to be familiar with your core abdominal muscles so you can target them by picturing them in your mind's eye as you exercise.
