If you were running on the treadmill at a New Jersey hotel this week, you might have seen a funny sight. A group of Jets offensive rookies gathered Thursday night in the fitness center at their hotel to hold a walk-through as they tried to learn the playbook for the team’s rookie minicamp. The skill players decided rather than studying in their rooms separately, they should get together and work. The only problem was finding a space. So, they decided to line up between the hotel’s ellipticals and stationary bikes. Rookie tight end Kenyon Sadiq speaks to the media during the Jets rookie minicamp in Florham Park, NJ. Bill Kostroun/New York Post “We had some space issues doing the walk-through in the weight room,” quarterback Cade Klubnik said. “We’re running about three-yard routes, but it’s better than nothing.” The rookies found a ballroom they could use Friday and they were able to run a few deeper routes.…