In 2004, Niina quit her day job and started full-time as an Ashtanga yoga teacher. This has been her sole career since. She founded an Ashtanga yoga school in Finland, first in Pori in 2007 and later in Rauma in 2009. In that same time period, Niina met Manju Jois who became a close and most important teacher to her.
Since then, Niina has regularly taken part every year in many of Manju's teacher trainings and workshops around the world. Niina also studies with him in Encinitas for longer periods every year. Manju visits Rauma every year to teach at Niina's yoga studio with Niina assisting him at workshops in Finland. In 2012, Manju Jois authorized Niina to teach Primary series.
Another close and important teacher to Niina is Kristina Karitinou. Each year, Niina visits Greece to practice with Kristina, Niina is very grateful for all the support and teachings from Manju and Kristina and for the opportunity to share this great practice with her students.