Doctors, scientists and sports leaders are charting the long road back to the playing fields for kids. The rules they're developing could be helpful for big-time sports as they try to get up and running themselves amid the COVID-19 pandemic. From New Zealand to Austria to the northwest corner of Utah, leaders are generating regulations that have potential to impact everything from workouts at gyms to youth baseball leagues to elite-level training with an eye on the Olympics. The U.S. Olympic and Paralympic Committee distributed a seven-page set of guidelines this week. It called on participants to “self-monitor for symptoms of COVID-19 twice daily,” as one of several steps in a multilayered return scenario.