There are different kinds of treks due to the geographical diversities and the trail of its difficulties. Trekking in the Himalayas of India and Nepal requires good health and reasonable physical fitness. Physical capabilities can be enhanced by pre–trek training, hill–walking or stair climbing, jogging 3 miles or cycling.
It involves trekking to altitudes of about 3000 M (10000 ft) or less, it is relatively easy walking up to 5 hrs/15 km per day, with the occasional longer walk. These treks can be enjoyed by anyone who leads a reasonably active life.
Easy to Moderate
Involves some longer walks, and easy to moderate trekking to altitudes between 2,000m (6,500ft) and 3500 M (11500 ft) for up to 6 hrs/20 km a day. Some previous hill-walking experience is desirable. Grade 2 may best be described as mild to moderate.
Involves moderate trekking to altitudes of 3000 M (10000 ft) to 4000 M (13000 ft) for up to 8 hrs / 25 km per day, sometimes including excursions or pass crossings up to 5000 M (16500 ft). Some pre-trek training is advisable. Hill walking experience, a reasonably fit body and good stamina are essential for these kinds of treks, which are generally longer (minimum 2 / 3 weeks) and more strenuous (long ascents/descents, steep gradients, rough ground).
Involves strenuous trekking to altitudes predominantly above 4,000m (13,000ft) with excursions and pass crossings of between 5000 M (16500 ft) and 6,000m (19200 ft). Pre-trek training is essential. You need to be very fit for these treks, capable of carrying a backpack, possess a fair degree of stamina and familiar with mountain walking. We include treks which involve river, moraine, glacier and snow crossing in this category.
Off the beaten track Challenging/ Adventurous
Requires a high level of fitness and experience walking on screw, snow, ice and packed snow. There will be ice axes, crampons, and in some cases ropes used.Climbs however are non-technical. The altitude would be predominantly above 4000 M (13000 ft) with quite a few nights above 5000 M (16000 ft).