The Thomas Inch dumbbell is actually 78kg (172lbs). And what makes it so difficult to lift is due to its wide handle diameter, which is 6cm. She lifted it up to knee-height I believe, and impressed Strongman champion Derek Poundstone by doing so.
Furthermore, Sayaka is a 2nd Dan degree Aikido black belt.
In all of AKB/SKE/SDN/NMB world, the only girl that I think can challenge her when it comes to strength, is KONAN -> http://www.hello-onl...15090817446.jpg
There was Shiichan as other alternative, but Sayaka toyed with her in a tug-of-war challenge in a SHUKAN episode, and in a handshake event she beat her in arm wrestling as well - which is Shiichan's specialty... (in her Janken reel, Shiichan defeats her camera man in arm wrestling)
Apart from KONAN as wildcard challenger, I have no doubts that Sayaka is Queen of Idols when it comes to power and strength :D
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