Climbing has become so popular it will make its debut at the Tokyo Olympics. Bouldering, one of the climbing events you’ll see in the Olympic games, is when people climb to heights of 20ft or less without ropes or harnesses (safety mats are often used). Climb any higher without wearing safety equipment and you’re into the realm of free solo climbing.
Where to try it: popularised in North America, indoor bouldering centres (with low walls to minimise injuries) can now be found everywhere from Great Britain to Germany. Indoors, try Grotto in San Diego and Earth Treks in Golden, Colorado. For an outdoors experience, give it a try in Squamish, British Colombia, or Fontainebleau in France.