Ben Langton Burnell's in search for adjustments as he looks to develop.

The Kiwi javelin thrower beat four-time Olympian Stuart Farquhar at the national athletics championships, though is still over two and a half metres off the world championships qualification distance of 83 metres.

Langton Burnell says there are both a mental and physical hurdles to overcome.

He says it's about both confidence, but also core and leg strength.

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Langton Burnell will try thrown the world championship qualifying distance at next week's Australian nationals.