O2Trainer 2.O Blue
$54.95
The O2Trainer activates your diaphragm and your external intercostal muscles , which are the muscles in between your ribs, these include the ribs on your back . These muscles are responsible for filling your lungs with air.
By working out your inhale muscles -the diaphragm and external intercostal muscles , you will be able to expand your chest more and faster .
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