Vikings running back Adrian Peterson said he plans to crank up his offseason workouts before the start of Vikings training camp. Making sure he’s able to handle it this fall remains the most important goal, and Peterson said he’s ready for that. But Peterson was on the field with his teammates yesterday as the Vikings wrapped up minicamp, and said the next month back in Houston won’t be a vacation. “Oh, no. The reigning MVP didn’t practice much coming down the stretch last season and performed sufficiently well, so the Vikings were comfortable easing off his workload this offseason.