Alvin Kamara is opening up about his offseason schedule and how NASCAR drivers can use his work ethic to be successful. While speaking to Kevin Harvick on Kevin Harvick’s Happy Hour, the New Orleans Saints running back reveals the work he puts in once the season ends. “My offseason is pretty intense,” Kamara said. “But I try to take some time, so right when the season ends, for instance, this year we didn’t make the playoffs. Our last game was January 7. From January 7 until about March 15, middle of March, nothing, just kind of relax, just go where the wind takes me.” Kamara also said he take…