It's not the exact same stuff, but for all intents and purposes if you're not planning on competing in a powerlifting event anytime soon it's close enough that

It's not the exact same stuff, but for all intents and purposes if you're not planning on competing in a powerlifting event anytime soon it's close enough that you could substitute it. It's actually used quite a lot for athletes who can't afford to have a sore lower back in training practice.