Jes Grosky and her boyfriend, Keith Shelter, were out for a hike near their home in Downey one weekend when they walked by a tree with a swing hanging from its branches near the trail. The tree was on private property so they didn’t use it, but the sight of it hit a nostalgic chord that stuck with them. “I just really wanted to get on and swing,” Grosky remembers. This sparked a simple idea. Why not build some rope swings and start adding them to their favorite trails? The couple, who on most weekends can be found with their hiking boots laced up, wondered if people would feel the same they did. “We wanted it to be a little surprise moment for people. Something for them to discover on the trails,” Grosky says. Their hope was that it would inspire people to get out more and reconnect with nature. In the last year, they’ve put up 19 swings and are hoping to keep expanding. To help spread the word, drop location hints and share …