im pretty good at freestyling, its not easy to learn. i actually played games with myself to help me practice.

like for learning good multies n shit quickly, id write down a small phrase or watever, and time myself for like 30 seconds n in that time id jus speak out as many multies as i cud think of for it.

n then jus walk around n if im on my own id freestyle in my head and use my surroindings to try make good lines n if it takes more than like 5 seconds to think of a dope line, move onto sumthin else.

shit like that, i found helped me, sounds a pathetic way to do it n shit, but it works