Marcus Mariota had a lot of issues last season. One of those issues was his fundamentals. It seemed like he threw off his back foot more last year than he had in the 3 years prior. Some of that was probably because of the leg injury he suffered at the end of the 2016 season, but some of that was probably because he did some back sliding in the fundamentals department.
One of the things he has talked about this offseason is throwing with a wider base. Well he is absolutely doing that thus far. Here is a picture of Mariota’s base when throwing last season:
And here is a picture from this week’s mini camp:
There is no doubt this is something Marcus worked at on his own this offseason.