The jolts are more jarring, the impacts feel harder and the pain hangs on longer for NASCAR drivers in the first season of the Next Gen car. Stories of sore backs, headaches and damaged ribs that don't heal as quickly as they did in the past are more common heading into the opener of the NASCAR Cup Series playoffs on Sunday at Darlington Raceway. Just ask Denny Hamlin, part of massive wreck late at Daytona a week ago.
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