The 49ers shipped to his Cleveland home a strip for his grass that outlines offensive linemen's positions.
"They wanted me to work more on my aiming points for the run game," Mostert said. "I'm trying to elevate my game."
He's also intent on getting more multi-dimensional as a receiving option, both out of the backfield or motioning into the slot. A former wide receiver in his Florida high school days and at Purdue, he had just 14 receptions last regular season and three in the postseason last year.
Staley may have retired, but his replacement at left tackle, Trent Williams, already has Mostert's admiration. "He's probably one of the most athletic guys I've seen thus far, on tape. I'm so excited to work with him and the entire O-line, because everyone else is athletic," Mostert added.
Despite Matt Breida being dealt to the Miami Dolphins, Mostert says the 49ers running backs will remain a close-knit group, one that brings back Coleman and Jeff Wilson Jr. to compete with Jerick McKinnon and rookies Salvon Ahmed and Jamycal Hasty.
On McKinnon's expected debut after two seasons lost to a knee injury, Mostert said: "I'm trying to pick his brain route-running wise and he's trying to pick my brain with the run scheme. We're doing a great job right now and I can't wait for him to show what everyone's doubting him on."
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