Trekking
Every adventure race includes treking of some sort. In shorter adventure races "trekking" may involve an all out sprint, however, for most races, participants must pace themselves to cover significant distrances. Unlike many running events, adventure racers may help eachother by towing or physically pushing slower team members, to increase the overall team speed.
In longer races foot care becomes a key focus, and foot injuries are a common cause for teams to be unable to complete races.
There are many excellent sites dedicated to improving general running skills (a select few are listed below). The focus of the information we provided, however, is tailored to the needs of adventure racers and we encourage to use them in conjunction with other sources of information to improve general running skills.
Lots of info about ultrarunning
In case the ten thousand links above weren't enough!