This is legal in some federations, but not all. Feet being planted/unplanted, ass touching/not touching. I could be an asshole for saying this but I've never found the overly arched style impressive. (She's 13 so I'll give it to her) But this arch puts excessive pressure on your lumbar spine, negates all leg drive, and quite frankly.. Requires no power or true strength to accomplish. Simply have decent triceps and an jacked up back and you can out "bench" other people your weight. This doesn't count as a power-lift to me. And I personally would never feel accomplished if I benched this way just to get higher numbers. I mean, why not just get massive breast implants, un-rack the weight, breathe, re-rack, break records. But meh, whatever floats your boat and makes you happy I guess.