Being able to break the mark whenever you like is invaluable.
Here are the physical tools that will really help you.
1. A wide release.
Don't be tucking that elbow into your body.
2. Hip flexibility
If you can't move your upper body out over your non-pivot leg, you won't get wide.
3. Leg strength
You need to be able to lunge out wide and be balanced once you are out there.
Tex and Jonno demonstrate the tools, even if these examples aren't necessarily break throws.