With a ‘Team Challenge’ obstacle course, orienteering, raft-building, bushcraft – even circus skills – kids have the opportunity to take Moss’s advice to heart by learning “how to safely take risks for themselves in a safe and secure environment.” The Kingswood website says kids “learn to work as a team, demonstrating support, tolerance and encouragement for others; time away from home encourages confidence and independence; key life skills development includes decision making, leadership, initiative and problem solving.”
Or you could look into Forest Schools, based on a Scandinavian concept that puts an emphasis on “child-led learning, based on small, achievable tasks.” The Green Learning Forest School in Cornwall states that its positive outdoor experiences “raise levels of self-esteem…develop skills in co-operation and listening, empathy and enthusiasm for learning.”
It’s difficult to see your child struggling with low self-esteem. If they’re not ready to clamber up the branches, maybe just finding a nice tree swing is a start.