freestyle

noun
1
a swimming race in which people taking part can use any stroke(= swimming style) they want (usually the crawl)
شنای آزاد
2
a sports competition in which people taking part can use any style that they want
سبک آزاد
freestyle skiing
verb
1
to rap, play music, dance, etc. by inventing it as you do it, rather than by planning it in advance or following fixed patterns
بداهه‌گویی, بداهه‌نوازی, بداهه‌پردازی کردن, فی‌البداهه اجرا کردن
synonym improvise