Strength CAN play a big part in it, but it doesnt have to. Mostly its balance and technique, but some freezes and power moves require a bit of strength... the thing is, if you practice them enough your body adapts to using those muscles, and you get stronger anyway.

Im not gonna go in depth, if you want me to, let me know, but heres the shit you should work on.

1. toprock and six step
2. turtle freeze and handstand
3. turtles and handglides
4. windmills

^that is sort of the quickest path to becoming a decent bboy... If you're looking to impress people, and you're impatient, turtles and windmills are the go. I suggest you look into other easy moves while you're learning those, as well.

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