Thirteen-year-old John Buettner grew up watching from his wheelchair as classmates played. That changed when he was invited to help design and test inclusive playgrounds, starting with Glen Lake Elementary in Minnetonka. He and other kids with disabilities brought firsthand expertise to make play spaces work for children who use wheelchairs and other mobility devices. The school effort began after students noticed peers “just sitting on the sideline.” Community fundraising took off—from bake sales and coin drives to a $50,000 gift from BMW—turning one planned piece of equipment into a fully…