Sitting down and writing every day will improve your freestyles. It will expand your memory of rhyming words, and it will give you experience working these words into clever lines. It’s also a good idea to write a few multi-purpose bars that you can spit at a freestyle in case you get really stuck. Put those lines in a “Break Out Rhymes In Case of Emergency” box, and smash the glass when you need help. This isn’t cheating; it’s shrewd.
You don’t want your “emergency” rhymes to be that obvious. Try to write rhymes that generally match your level of freestyle but are clever and smart.
Writing raps will help you freestyle. When you write, rhymes become embedded in your head, and you’re more likely to be able to pull these rhymes off the top of your head in a freestyle.
One of the freestyle kings is a rapper from North Carolina named Spectac, who can spit a rhyme off the top of his head that sounds like it was pre-written. I’ve heard Spectac freestyle for 40 minutes straight over various beats, and I’ve seen him in action at a show, getting some kid to walk around the audience pointing at things and Spec rhymes about it. I asked Spectac what it takes to freestyle. Here’s what he told me: