Trail running company Harrier has launched a challenge to encourage more people to go outdoors this summer. Harrier, which designs and sells trail running gear including running packs, running jackets and poles, has come up with the #TrigBagChallenge to get you out and exploring.
Trig bagging is an activity that sees runners and hikers travelling to triangulation pillars (better known as trig pillars or trig points), which are dotted around the UK.
