if you haven't done it before, you may find that floating is more beneficial as rest than hauling yourself out of the water onto the side. the added bonus of being able to see whats going on in the game is too valuable to throw away, plus it's possible to stretch etc while in the water... drinks etc are generally in a floating bin at the back of the subbing area or on the poolside.

...if you get cramp in a game, you don't swim to the side, strecth for a few seconds and then rejoin the game... you just sub out. far better to get someone 100% capable in the water and then take a decent amount of time making sure you get yourself as right as you can.

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it's more polite on the grating than on the subs bench