David Hopkins, national programme manager for youth charity Catch 22, explained that it was vital to give young people opportunities in parks. He has been working on projects including a youth allotment scheme in Bristol.
"If you give young people a chance and a sense of ownership, they can achieve brilliant things," he explained.
London Borough of Tower Hamlets outdoor education manager Nigel Richardson agreed: "If you give young people the opportunity to get involved in the right sorts of activities, then nine times out of 10 they will do something good."
Richardson runs the urban adventure base in Mile End Park, which organises activities such as cycling as well as climbing, canoeing and a range of other sports.