Bas Rutten (inferred)
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“there's a device called the O2 trainer it's a mouthpiece with it's a respiratory trainer and I do find those extremely helpful on a number of levels”— Tim Ferriss
“the O2 trainer which is a resistance device that allows you to have progressive resistance by breathing through a mouthpiece ... I've been super impressed by it”— Tim Ferriss
“I used the O2 trainer to prepare for my extensive hiking at altitude in New Mexico and I found it to be very, very helpful and easy to use”— Tim Ferriss
“we'll link to all of the social as well as the O2 trainer which we're going to get to you can find that on Instagram at O2 trainer”— Tim Ferriss