He asked her to challenge Emmett to an arm wrestling match.
Emmett and Bella have an arm wrestle in the book "Breaking Dawn" during Bella and Edward's wedding reception. Emmett challenges Bella to a friendly arm wrestling match, which ends with Bella surprising everyone by winning.
on her arm
they had an arm wrestle (bella won)
In New Moon, when Jasper tries to kill Bella, Edward pushes Bella down on to a glass table that shatters and slices her arm, sticking several small plates of glass in the cut.
BELLA
Arm-wrestling!
Emmet Cullen :)
Bella got the scar in twilight for James a tracker. he tricked Bella into thinking that he ha her mother so that he could kill her. but when James bite her(on her wrist) venom sarted spreading in her arm but edward sucked it out but she still has aliitle venom there it always colder there to
an arm wrestiling match
page number 518.
In Breaking Dawn 2, Bella Cullen wins her arm-wrestle with Emmett Cullen.