Cross-country skiing is seen as the greatest test of endurance, flexibility, skills, and speed in the skiing world. Athletes require endurance, speed, and strength in abundance in order to succeed in this winter sport. One of the first recorded cross-country skiing competitions took place in Tromso, Norway, back in 1843, and the sport has grown in popularity ever since. Cross-country skiing has its roots in Norway, so it is unsurprising to discover that some of...