R package animation comparing nfl combine stats over the years. BMI forty yard dash idea Idea from https://medium.com/@slackjack314/bmi-speed-and-nfl-positions-11f90b407551 as I know nothing about NFL. data fromhttp://www.nflsavant.com/dump/combine.csv this type of graph i learned at https://www.r-bloggers.com/ggplot2-easy-way-to-mix-multiple-graphs-on-the-same-page/