Instruct: Classify Amazon reviews into positive or negative sentiment
Query: POWERbreathe as advertised

The Gaiam Powerbreathe seems to work as advertised. The instruction booklet is clear and it is fairly easy to learn how to use it.It is too early to say whether or not the Powerbreathe unit has helped my running. Some days, it appears that it has; other days, the reverse is true. But I've only had it for 3 weeks, so I'll keep trying.