This is not for the bout, but after, when you are going to sleep. I just got over a bout of bad back spasms and found it really hard to get to a comfortable position to sleep, but found that the smelly "icy hot" patches worked wonders. So when you're all tired and s4 has rubbed you up, slop one of those babies on and it will help you nod off (altho you may be so tired after your bout that it won't matter, but just in case) I've used the hot water bottle thing, too, but for sleeping those things are a little bulky. Kick ass on your bout, I wish I could be there!