There was a time when tree climbing was thought to be a pursuit only available for children and chimpanzees to enjoy. But soon thrill-seekers realised that climbing trees was just another way for them to get their adrenaline fix. There is actually a surprising variety of methods available to the climber, many of them very similar to rock climbing. Free climbing and lead climbing are both possible when trying to make your way up through the branches, but the Double Rope Technique is probably the most popular. The DRT can be practiced by solo climbers who use two ropes to make sure they are always protected. .