O2 Trainer

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Nov 2013
9:53pm, 12 Nov 2013
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Too Much Water
Anyone ever used one of these?

amazon.co.uk

I know a few folk who've used this as part of their fitness work for MMA, and also for climbing. Considering giving it a go for running as it is a way of mimicking high altitude and building lung capacity. Any thoughts?
Nov 2013
8:56am, 13 Nov 2013
3,649 posts
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Too Much Water
Any morning people got thoughts on this?

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Anyone ever used one of these?

http://www.amazon.co.uk/The-Official-Rutten-O2Trainer-green/dp/B00...

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