he established the kangaroo sanctuary of alice springs in 2011. and this is him taking a morning walk with his family. >> a morning hop. >>> switzerland used to conjure up ideas of hot chocolate and cute mountain villages. it's summertime so the snow has long since melted but that doesn't mean you can't go out there and have extreme fun on the hillsides. we have a high line stretched between the two. >> okay. >> yeah. call in some of the best, decided to stretch out to start just a 45 foot long run. no big deal. difference is, it's 45 feet, 328 feet off the ground. and it's got about a ten foot incline. >> that's just about what they're doing. >> samuel calls this part surfing. he's a world record holding for doing the highest high line ever. he can't just walk across them, he can also do this. >> what? what the heck? he is not doing a handstand. >> stunning amount of stabilizing. >> i don't want to believe it. >> incredible. once they've got that done, they stretch out 104 foot line ending 40 feet higher than where he began. towards the end here,