90" is better if you want to be able to do some of the full back moves, and is reasonably easy to use for all other rolls as long as you have a little extra room. Also 15" diameter is more useful I have found.
Ta mate
So like this one? http://www.physiosupplies.com/fitness/EVA-Foam-Rollers-15cm-x-90cm.html
Looks maaaasive

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