rory mcilroy is no stranger to pumping iron , the world 's no 1 golfer will need more than a few extra sessions in the gym to get close to matching american teenager brad dalke .
mcilroy had run a clinic and offered some inspirational words to players on friday at a junior invitational at the sage valley golf club in graniteville , south carolina , sponsored by nike .
there he met dalke and the pair agreed to an arm wrestle .