It's another job to juggle for Van de Elzen. The award-winning chef and TV presenter, of The Food Truck and Family Recipes fame, already has his hands full running his new Ponsonby "chicken kitchen", Boy & Bird, being Dad to two preschoolers, and planning a major move to the country.
So what do you do when you're that busy? Take on one of New Zealand's toughest mountain-bike treks, of course.
In segments filmed for Kiwi Living, Wann is working with Van de Elzen to help him reach his goal this winter of mountain-biking the 85km Timber Trail, between Pureora and Ongarue to the west of Lake Taupo, and then the gut-busting Heaphy Track, in the Kahurangi National Park in the northwest of the South Island.
"There are longer rides, but the Heaphy is the toughest because of the terrain. The elevation is massive. The first day is just 16km going up," Van de Elzen says with a nervous grin.
"I went on line to have a look at it and it says 'this is not for the faint-hearted'.
"I've been riding for a long time, but I've got to be more prepared for this - it's not just
a weekend joy ride. I want to enjoy it and if I'm not ready, I won't. I'll spend half the time in cramps and cursing my body."
Which is where Wann comes in. But don't think she's going along for the ride.
"Not at all." She shakes her head emphatically, laughing. "Not my thing. People tend to think fitness people love everything fitness, but not me."
Van de Elzen says mountain-biking is his favourite form of exercise because it can be fitted around his busy lifestyle and often unsociable hours.
"The hours I work as a chef means I can't do team sports because I can't make practices or games. The restaurant is open seven days a week for lunch and dinner.
"But I can go mountain biking in the forest by myself when I can find the time.
"I also like the adrenaline rush I get from biking. And it's amazing - when I go riding,
I start out with so many questions in my head, then when I've finished I've got all the answers, without really having to think about it."
He turns to Wann. "See, exercise raises your IQ."
Wann says that is key. People are more likely to reach their fitness goals, and have fun along the way, if they find a sport or exercise regime they like doing.
"It's a fundamental that people forget. They think it has to be hard or painful to be beneficial. But you don't feel the pain when you are doing something you enjoy."
"Apart from in my spine, my stomach, my legs," Van de Elzen adds.
"On our first session she had me doing things I'd never done before, so I was using muscles I didn't know were there. Or maybe they just weren't activated."
"They were just a little sleepy," Wann says kindly.
Training for the bike rides is just one aspect of the show that the pair have worked on.
Van de Elzen's adventures have included making buffalo mozzarella, brewing beer and investigating the catering system on a P&O cruise ship, while Wann has tackled such "lifestyle hacks" as what to add to water to get more out of it, facial exercises that help to reduce wrinkles (she says she felt silly filming the segment, but apparently they work) and making bone broth, the next big nutritional thing, with Van de Elzen.
Although Van de Elzen is no stranger to the old adage "never trust a skinny chef", he and Wann agree it's important to balance a love of food with a healthy weight and keeping fit.
"One of the chefs I really like and respect, and I know not everyone does, is Gordon Ramsay. He is a fantastic chef and runs great outlets and the stress he must be under is enormous, but he can still get out and run the New York Marathon.
"And on the food side, I'm lucky enough to have my own restaurant, so I can change the food to my tastes."
Wann so approves of the healthy offerings at Boy & Bird that, in her role as Warriors team nutritionist, she takes the players to eat there.
"It looks like I'm on a date with five guys," she says. "The food is so clean and so good and all made from scratch. Not many restaurants do that," she says approvingly to Van de Elzen.
"I see they won again last week," he says.
"Must have been the chicken," she replies.
