Mild spoilers ahead...
I'm super confused by the reviews that south east Asia team had it easy. They had what appeared to me to be the second most challenging course out of the 4 teams (north America team had the most challenging). South East Asia had to hike, rock climb, mountain bike, row, swim, white water rafting.
The Russia team had it so easy, they literally spent their whole time driving, flying, or on a train (with beds). Once they had to cycle then ride horses. The only time they had any kind of rock climbing there was basically a ladder for them to use.
North America had it the hardest from the start. Scaling sheer cliff edges (and sleeping while suspended), climbing and trecking through the Rockies, carrying a canoe through thick brush.
The narrator of the show assures the viewer that the courses are equally as challenging and fair but it doesn't present itself that way to the viewer. Good show though, definitely recommend.