He is hitting his jumpers - such an important part of his job - and also getting round the field, running the ball up and making the tackles.
Coltman does not make it complicated. After all, his job in the front row is no-frills stuff.
"I'm just having fun. That is all it is - just focusing on what I have to do. I've worked on a few different areas."
He had spent many hours on his lineout throwing since last season and it seemed to be getting results. Assistant coach Tony Brown had helped him, getting the right balance when throwing and getting into a routine.
Coltman said the Highlanders were excited about the Sydney semifinal and had to keep up the momentum gained over the past few weeks.
"We just have to fine-tune a few things and we'll be right. Last week, with the crowd, it was unbelievable. It helped the boys get up and stay there."
The Waratahs will be just as physical if not more so than the vanquished Chiefs but the bushy-bearded hooker is ready.
"They're a big side all right, and a good side as well. I'm absolutely pumped. We just need to stick to what we do and play our game."
Coltman, who has signed with the Highlanders for another couple of years and will play for Otago this year, was in the All Black frame last season but missed out this year.
Coltman will be without his No1 supporter in the crowd tomorrow.
His father, Tom Coltman, drives from his Taranaki farm to all corners of the country following his son. But he and his booming voice will not be in Sydney.
"Dad has not got a passport, so he can't make it. He's seen nearly all of the games so far. He loves it." Otago Daily Times