As a physiotherapist I gain a great satisfaction when small things make big improvements to pain. Although groin pain is complex I find this one of the most common physio tricks that can, in some cases, reduce pain instantly. So I tweeted about it and then someone asked me to elaborate it.
I hope it helps you but please make sure you get your groin pain assessed, diagnosed and treated by a physiotherapist and osteopath. If you want any other info including physiotherapy exercises check out our website pages on hip and groin pain.