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@DFP
Oh my god, you didnt actually buy those did you?
Its as much of a silly useless snake-oil gimmick as the "shake weight".
But with the added likelihood of injury.
It was a brilliant idea on the account of the manufacturers/designers/marketers and advert creators though. They have done their job well and will make fuck loads of money with this.
If you want to hit your glutes intensely, just walk up some steep stairs with a rucksack on. Ideally two at a time.
Also an excellent general leg exercise with hits the muscle around the knee and the glutes pretty hard is walking lunges. If you need tips on how to execute correctly I can advise.