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OfficialBasRutten, inventor of the O2Trainer, answers what to do if you hear a whistling sound coming from the resistance cap on ...

Learn more and save 15% with code BASRUTTEN at https://www.getmte.com.

Today I use a tool to help explain the physiology of the diaphragm - the primary muscle responsible for breathing. O2 Trainer from ...

If you want to fight like a pro, you need to master the basics, and that starts with STRIKING distance, do NOT confuse this with ...