NURMI-Studie Step 3 Today on March 1, 2015, the Nurmi main study starts with STEP 3 and goes to the target straight line with just under 2,300 participants. From today, the Nurmi runners start with STEP 3 in the Nurmi running season and finish their running events about half marathon or marathon distance. All information about Nurmi-Study can be found on the Nurmi website under https://www.nurm-study.com/about