Regarding the difficulty level of any trekking route in Nepal, we must not overlook the issues of altitude sickness. Walking at sea level or slightly higher for several hours is quite comfortable for most people, but when you start getting over 4,000m (13,123ft.), then those several hours seems to feel never-ending. The Annapurna circuit route is the longest route in this region and is a complete circling of the Annapurna massif. Comparatively, it is considered to be harder and longer in duration than the Annapurna Base Camp Trek. It is because hikers will be walking across the high-altitude Thorong La Pass at 5,416m (17,764ft.). Besides the altitude, what really make this trek hard are the steep climbs and long distances along with pared-down amenities. The route usually remains closed during the winter season due to the heavy snow accumulation on the trails. As it is a long trek, you need to be in great shape of physical fitness so that you can walk for at least 5 to 7 hours each day. Even beginners can do this trek provided that they train themselves at least 3 months prior the trek. Cycling, swimming, acrobatics, hiking, jogging, and cardiovascular exercises are some ways to get your body trained for a successful journey in the Himalayas.