Our instructors

each and every one of them enthusiastic outdoor athletes and hosts or hostesses...

Our instructors

Our instructors have two things in common; they all love the outdoors and are thrilled to share it with you. In addition, they are all seasoned hosts and hostesses and will ensure that you lack nothing.

In most cases, our instructors have completed training at, for example, ALO, CIOS or a comparable sports training. Others have acquired their knowledge through all kinds of sports organizations such as the Dutch Climbing and Mountaineering Association (NKBV).

In addition, everyone is obliged to follow our annual, internal training program.

Ton van Grondelle

Owner of VenturiX Outdoor, responsible for sales and organization. Host, cook, mountain biker, climber (in this order) and get completely happy when the temperatures drop below zero and you can (telemark) ski off the beaten track.

Active in events since 1992, from very large to pleasantly small, and in 2008 exchanged his pinstripe with tie for a pair of mountain boots.

Roswitha Wintermans 

Our female strength as Operational Coordinator in the VenturiX Outdoor team! Helps ensure that almost everything runs smoothly! Balance is the magic word of life, with Roswitha in your area you come pretty close! Fanatic with a winning mentality, which helps you to experience new beautiful adventures.


Vera van der Meijden

If the wind suddenly starts to blow very hard in the Ardennes, you don’t have to worry; that’s our own whirlwind Vera. The three things she loves most in life are playing outside, playing outside and playing outside. Of course she will gladly take you there.

Just graduated from the Fontys Sports College, where she specialized in Adventure Education, she came across our (forest) path and does not want to leave for the time being. Everyone happy!


Lisanne Coolen

Our rest in the surf, is in her last year of study at the Sporthogeschool in Eindhoven and is currently graduating with us. Delivers her knowledge and expertise to us in the Ardennes and is ready for you to experience the adventure together!


Wouter Pastoor

Cheerful type, was our operational coordinator until recently. Will work for us from now on, every now and then. After all, he remains an outdoor romantic through and through…


Kaya van Grondelle

A young and upcoming talent in our ranks. Was able to crawl at 8 months, walk soon after and went to via ferrata almost immediately. A good shooter with a rifle and a (cross) bow, and nowadays also on a mountain bike. Likes to sleep in the woods, but hopes there are no spiders in the bivouac.

Was Down Under for a long time, but has come back just for you!

Wietze Venderink

He once studied sports management at Fontys University of Applied Sciences and as such did an internship at VenturiX Outdoor. Is now participating with the big boys, and that can make us and you very happy. Climbs, cycles, shoots, walks…, all just as easy and also happy to teach you.

Looks like he likes to sit in the snow and is also a gifted Alpineur (we’ll look it up later).

Ymke Lathouwers

Don’t let her early years fool you! It seems that in the Netherlands only Frans Timmermans has more stamps in his passport than Ymke. So a world traveler, and can tell you well about it. She studies geology, but if that is not really necessary, prefers to climb, kayak, cycle or jump out of planes or a bridge. In short; an afternoon with Ymke never gets boring.

Mathias Michielsen

Represented in a very cheerful way our Flemish squadron. Enthusiastic biologist and passionate packrafter, bushcrafter and all-round outdoor type in summer and winter. Pleased to point out animal tracks, edible plants and mushrooms during trips on land and water.

Never feels too bad to spend an extra round with you.


Chaneequa Kocken

Exotic name, yet completely Dutch Polder. She learned to kayak here early on, but that flat water got boring very quickly. Now preferably to be found in the middle of a major rapid. Connoisseur of the Slovenian mountains, PE teacher, physiotherapy student and apparently also sometimes jumps out of a plane.

Brecht de Meulenaer

Brecht is an ornithologist (do you look it up yourself, or should I say it?) and glacier guide and in that capacity he travels all over the world. Check @japatta on instagram, and be amazed…..

Every now and then this Belgian is still in Belgium and he knows how to find his way there (here?). Loves to climb rock and ice, passionate telemark skier and enjoys cycling through Europe in his spare time.

Bram Krumm

No, this is not a joke. This is Bram; or actually when he was still Brammetje, and in 2011 he was with us for an exciting father-son weekend with his dad. One thing Little Bram knew for sure, when he got home muddy and tired; he also had to become an outdoor instructor. And he is now, back with us, and with all his Limburg heart and soul. Brammetje has become a very big Bram.

Now presses 150 kg as a personal trainer. In the photo, he just didn’t weigh that at the time. Oh yes, Grote Bram is now studying to become a PE teacher.

Mike van Eijnatten

As a Highly Gifted Climber, it is impossible for Mike to hide his enthusiasm for mountains, rocks and everything associated with them. Your own fault, big bump when you ask a question about, for example, a random rock or a specific kind of carabiner. That will cost you a few hours of your life. But comfort you; they are spent.

Photographer, motorcyclist and Brabo. Enough to talk about, so…

Hedwig Fossen

What you get from afar is often very worthwhile. So we came across Hedwig, uut Grunningen, where she studies science communication.

Just for the gentlemen among our guests, with an increased testosterone level; if you are lucky enough and are allowed to go on a mountain bike with Hedwig, we will tell you in advance if you think you are going to attack… MISSION WITHOUT CHANCE. Whopper on the narrow irons, and the (narrow) tires.


Rico Jacobs

Knows better than anyone how to get humanity moving as a PE teacher and personal trainer. And if you’re a little afraid of heights, Rico will talk you through it. Climbs, cycles and always the happy note.

Matthijs Spruyt

Let fairy tales come true in everyday life, in an undisclosed amusement park. But if he can only get away from his wife and children for a while, Matthijs can be found in the Ardennes, or at one of our locations in the Netherlands. World traveler, videographer, excellent host and of course also a very passionate outdoor athlete. ‘Can’t’ is not an option, drag you through everything. By bike, on the rock or in a kayak.


No large groups, no long waiting lines, only authentic outdoor activities under expert guidance in the open nature, with respect of everybody's individual capacities and the natural surroundings.