Most people who gravitate toward copywriting love words. Dishing up lots of them is relatively easy. The real challenge is editing to achieve a tight and lively style.
So if your writing has become bloated and sluggish, perhaps what you need is a little exercise to trim the fat and energize your selling copy.
The exercise I have in mind is based on radio advertising and will challenge you to write a complete, action-inducing sales pitch that can be spoken aloud in exactly 60 seconds. I got the idea for this recently while writing radio ads for several products. It occurred to me that while this form of writing uses few words, it takes incredible discipline to make those words sell.