@godsgrl34 Dude, just stretch. Why are you overthinking such a simple thing?
If you're looking for "scientific literature", there's this amazing website called Google where you can type in words and it'll give you millions of results.
@serina1995 You're also kind of comparing two separate things. A person above 6 ft is still more capable of doing the planche, at least a straddle, by practicing and increasing their strength...whereas a manlet, no matter how hard he trains, will never be able to dunk.