The coach of Sam Ruthe has praised the acceleration of his charge's rise from exciting prospect to two-time senior national champion.

The 15 year old stunned at the national track and field championships in Dunedin - sharing gold in a dead heat with Olympian Sam Tanner over 1500 metres.

Craig Kirkwood mentors both Ruthe and Tanner - and he joined Piney to discuss the win.

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