This is really meant for females but anyways...

I sit on the couch in a hunched over position with a heat compress of some kind. :p I've found that taking a painkiller before the cramps, or before they get severe helps a lot too. Obviously painkillers would help anytime, but this way I can avoid more of the pain and discomfort.
I also take baths with a fair amount of epsom salt in the water. Though I only do that when it gets really bad because it's the most tedious out of all my little remedies. :p