http://www.trxtraining.com/connect/blog/2011/09/07/raising-the-bar-rip-training-principles/?utm_source=SilverpopMailing&utm_medium=email&utm_campaign=2011_09_September%20Newsletter%20(1)&utm_content=&spMailingID=1933951&spUserID=NTAxMjI3NjE3S0&spJobID=31264549&spReportId=MzEyNjQ1NDkS1

have you seen this?
I think it's dumb. You can do the same stuff with a cable machine or resistance bands.