The two recent academy graduates will be in Whanganui until the end of December.
"I have always found gymnastic fun and challenging, and therefore I started as a coach to pass on this nice experience to other kids," said Olsson.
The pair say their experiences with the Whanganui club have been good.
"We have met the different teams and have started to coach both kids and adults.
"They have been very welcoming, like our new colleagues and host, and we are really looking forward to the next couple of months with them.
"We are very excited to teach danish gymnastics in the gym club as well as learn more about the gymnastic culture here in New Zealand."
The new coaches, along with a few of the club's own Ollerup graduates, will be hosting a coaching and tumbling workshop soon.
"They are a fantastic asset to our club and our gymnasts are very lucky to have the opportunity to learn from them," said Head Coach Kelly-Taylor Ward.