I have always done ukemi by bending my arm inwards so that it form a large arc which acts like a wheel. but recently I realized that it takes a little bit of arm strength to support the body for a moment before rolling forward. I thought ukemi doesn't require any arm strength at all? or is my view wrong?

in another forum, someone told me that they do ukemi not just by lowering their arm but they lower their arm and then moving it backwards so that it feels like their back is sweeping the mat.

how do you do ukemi? is it different for each dojo?