Doing it on a mountain bike where one stretch of the course has marker posts rather than a track is entirely another matter.
Of the 49 riders who attempted it around Lake Hawea on Saturday during the annual Contact Epic, nine riders spent more than 12 hours in the saddle.
And, even for the winners, Johnny van Leeuwen (7hr 13min 2sec) and Ronel Cook (8hr 53min 53sec), both of Dunedin, it was no walk in the park.
Their "100-mile" course took them far into the headwaters of the Hunter Valley, where no bike tracks exist.
"We had to actually create our own track to get to that point.
Two years ago, Van Leeuwen, who is a fulltime landlord, rode a 100-mile event in the United States which began at the same altitude as the top of Mt Cook, and continued upwards.
Cook, originally from South Africa, and employed at Moana Pool, won the event for the second time - enjoying the challenge of the rocky, "hard-out mountain biking terrain".
Cook has previously won 24-hour mountain biking events, covering 311km in that time at Rotorua three years ago.
While the extra distance beyond the 125km Epic course on Saturday won the pair the bragging rights, the prize money is still attached to the main event, won by Ben Oliver, of Christchurch (4hr 43min 39sec), and Kate Fluker, of Queenstown (5hr 32min 53sec).
