Take some poem you aren't progressing with. Rewrite it twice:
1) Fatten it up, pump extra words into it and make it really obese. Don't use just any words, they have to have relevance, but do not respect the original conception or sensibilities of the poem either. Add:
- adjectives, adverbs
- clauses, sub-clauses
- asides, tangential remarks
- whole extra sentences on subjects peripheral to the core...
- you get the idea
2) Then... you guessed it. cut the poem down again. Not back to where you started, but by taking what you now have as a start-point. e.g. carefully consider what you have, and what it now says, and slim the poem down to strengthen and emphasize that. If it is the same subject matter as originally, fair enough, but it probably won't be handling it in the same way...
Post both poems below here, either together or days apart if that's how long it takes and we can make a list of our top slimming tips when we're done!