In album: N33 Nitric Oxide
N33 Nitric Oxide You can boost your workouts by controlling your breathing. When performing situps or crunches, you should make a forceful exhale when the shoulders are at the top of their movement. When you contract deeply through exhalation your abdominal muscles are forced to work harder. Read more>>> http://www.thehealthvictory.com/n33-nitric-oxide/