Training Mask – First Review

First review Training Mask...if ever a time it is now! Did various intervals using a rower with easy, moderate, fast and sprint. On first round through felt a bit claustrophobic but this forced me to really focus on controlling my breathing on the easy periods and not freaking out. Only lost about couple of secs on my expected times. Heart rate was quite similar to normal. The main notable difference was the extra work the diaphragm and intercostal muscles were having to do. The way I see this tool on first glance is not to mimic altitude but purely resistance

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