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here's proof that Ina is NOT stronger than Gura
she was in fact just tryharding like she always do
notice how she's facing her body sideways and inclining her body together with her arm, that is the proper technique for arm wresting, it allows you to use your body weight and back muscles insted of only your biceps, which was the case of Gura who was facing Ina, relying only on her arm strenght.