I love Running

Especially Trial running

Trail running is a sport-activity which combines running, and, where there are steep gradients, hiking, that is run "on any unpaved surface". It is similar to both mountain and fell running (also known as hill running). Trail running normally takes place in warm climates, or on good paths, or tracks which are relatively easy to follow. Unlike road running and track running it generally takes place on hiking trails, often in mountainous terrain, where there can be much larger ascents and descents.

Read on Wikipedia