This year, the Giants, like many other N.F.L. “I do kind of miss that traditional camp life,” Giants quarterback Eli Manning said. When they make the playoffs, the Giants are a threat to win the Super Bowl, as they showed two seasons ago. Around him the offensive line and the receiving corps are working to get and stay healthy and be cohesive. Once upon a time, pro football training camps were like other summer camps: dormitory-style rooms in a country setting, a day overloaded with physical activities, communal meals and lots of late-night bonding. For N.F.L.