Well if you have a 40" blade, it might turn into a pretty good work out depending on how quickly you can whip that thing around.
A friend of mine has the Raven with a 40" blade and it's certainly a handful, the extra weight really make dueling with it pretty great. Though dueling against it is... More difficult if you have something of a smaller size like I do.
imagine that: lightsaber spinning as an exercise routine. that'd be fun
thank you for ur thoughts but ill stick with 36"