Ok some training things you need to do our sprint miles to get a fast time(improves leg strength and speed), do many hitting drills[especially drills were you play as the running back with a linebacker trying to tackle you, you must go head on and try to run over the linebacker](this improves your trucking ability, which is very useful, and will get the fear of hitting away), ok and one last drill I would suggest is shuttles[especially short shuttles](this improves your ability to juke and do counter plays). Ok so there are a couple drills for running back. Good luck bro. Also by the end of the next season it will really help if you bench around 175-225 it will help if you are a running back. Haha but to all lineman you want to be benching around 200-275 your sophomore or junior years.