Following the launch of Tri-Adventure in 2010, two new races have been added to the calendar for June and July.

The Tri-Experience is a three-and-a-half hour adventure race, combing off-road running, mountain biking and navigation in Swinley Forest, Berkshire on the June 12. 

And on July 10, the Tri-Challenge will push racers even further through navigating on foot and bike for a total of five hours on the North Downs.

The established Trail and Sprint series will run on the third Sunday of February, March and April.

The format for all events remains the same: solo entry, with a mass start on foot. Competitors must gather as many checkpoints as possible within the agreed time limit, with one transition to bike in the Sprint, Experience and Challenge events.

Online entry is now open, head to www.triadventure.co.uk for more information.