The individual workouts are voluntary and there are strict guidelines that go beyond those the NBA disclosed in a comprehensive memo sent to teams more than a week ago. “This isn’t a hangout session for the guys,” a source said. “We’ve read the riot act so to speak to these guys. I think they are appreciative of us trying to find the right way to get the building open because they need the outlet and want to work out and this is the safest place for them to do it.”