Skip trying to simply sweat off the pounds with saunas and sweat suits. For true, lasting weight loss, instead keep your focus on a consistent, balanced workout plan and a healthy diet with the right caloric deficit.
I'm thinking about training for a marathon. A marathon is 26.2 miles or 42 kilometers. Although some marathons differ in their terrain (some are very flat, some are extremely hilly) and degree of difficulty, the distance is always 26.2 miles. Races that are shorter or longer in distance have different names (such as 5K, 10K, half-marathon, or ultra-marathon).
The marathon as a race was cooked up as a run from Marathon to Athens. The distance increased by a little over a mile to the current 26.2 miles (42.2 km) at the London Olympics to accommodate a start at Windsor Castle, and that distance was adopted as the standard in the early 1920s.