Accepted participants are invited to the study by personal e-mail including the detailed announcement of the study and approval papers to be signed in. The tester of each sport club, responsible for conducting the fitness measurements (baseline, 3 months, 12 months) will receive text message from UKKI including names and phone numbers of accepted study participants. After that UKKI sends similar type of text message to each Fustra exercise leaders including only those participants that were randomly allocated to exercise group.