any long and difficult trip
journey on foot, especially in the mountains; "We spent the summer trekking in the foothills of the Himalayas"
make a long and difficult journey; "They trekked towards the North Pole with sleds and skis"
a get-to-know-yourself three-week or three-month journey that brings people together to make lifestyle changes, supporting one another as they add Glyconutrients, antioxidants, phytonutrients, exercise and low-glycemic-load eating to their daily lives
a journey that can be challenging and sometimes even arduous
a mountain walk from place to place, rather than just rambling or day walking from a fixed base
a walking from place to place in the villages, hilly regions, foothills and mountains