About us

For more than 25 years we have spent our spare time and our holidays in the mountains. We took three sabbaticals so we could practise sports in the mountains and enjoy its scenery as well. In 2017 we decided to turn our old dream into a new project, Mountivity. Because we kept going back to this location, Vallouise-Pelvoux was an obvious choice.


  • Master Physical Education (KULeuven)
  • International Life safer
  • Ski instructor BFSI
  • Trainer Red Cross
  • Aerobics instructor
  • Windsurfing instructor
  • Safety and rescue on wild water certification regarding rafting (IRF)
  • Physical Education teacher in Sint-Eduardus Instituut Merksem Lerares lichamelijke opvoeding in Sint-Eduardus Instituut Merksem
    • Founder and coordinator international projects
    • Team coordinator
    • Outdoor trainings
  • Organiser Belgian Raft Race


  • Master Physical Education (KULeuven)
  • Diplôme d’Etat canoë-kayak et disciplines associées (ranging from kayaking, rafting and hydrospreed until wild water class 5)  First Fleming with this French diploma
  • BACP Canyoning Guide
  • Instructor/ trainer kayaking wild water (Vlaamse Trainersschool= Flemish training school)
  • Co-author of “Safety and rescue on wild water”
  • Instructor climbing (Vlaamse Trainersschool)
  • International Life Saver
  • Lecturer at Karel de Grote Hogeschool Antwerpen, responsible of outdoor activities
  • Expert kayaking according to the Flemish Colleges at VTS – Sports Flanders
  • Expert climbing according to the Flemish Colleges at VTS – Sports Flanders
  • Trainer climbing skills certification 1, 2 and 3 at Climb – and Mountain Sports Federation Flanders
  • Freelance outdoor guide at Wild Trails in Belgian Ardennes

Marleen en Bert

  • Canyoning in French Alps and Pyrenees, Spain, Italy, Switzerland
  • Trekking (always completely independent) in Europe, North- and South-America, Asia, New Zealand.
  • Climbing across the entire world
  • Mountain biking and cycle trekking (e.g. tour in the Balkans/ the Balkan region)
  • Skiing, ski touring, alpine skiing and speed riding
  • Parapenting
  • Kayaking and rafting

Most remarkable achievements

  • Marleen: Captain of Belgian women’s rafting team – European Champions 2012
  • Bert: sport climbing level 8a
  • Together:
    • Trekking Cordillera Huyhuash, Peru, 15 days
    • Trekking Kangchenjunga, Nepal, 23 days