http://www.azcentral.com/story/sports/heat-index/2015/03/18/former-asu-cornerback-robert-nelson-can-drag-a-car/24978505/
http://www.clevelandbrowns.com/news/article-5/DB-Robert-Nelson-training-with-his-Smart-car/04e41958-d09a-4902-827d-f1de1e874dd2
Smart Car is about 1,800 pounds. I used to push my 1986 Toyota MR2 around, and that weighed 2,400 pounds. And I'd do it on grass, not a smooth parking lot.