There are many elements to a running game that can make it successful. The use of motion is one factor that has become more popular in recent years.
Few coaches around the NFL do a better job of creating running lanes than 49ers Head Coach, Kyle Shanahan. He perennially has one of the most, if not the most, versatile running schemes in the league, using everything at his disposal to create favorable matchups and blocking angles.
Motion is one of those tactics that he leans on regularly to generate successful plays on the ground.
This example from the 49ersβ 2019 Divisional Playoff win against the Vikings is one of the best illustrations of this.
San Francisco came out in β11β personnel and a 2x2 formation with 2 wide receivers aligned to the left. The Vikings matched up in nickel personnel and aligned their nickel-DB/safety to the 2-WR side:
Wide receiver Kendrick Bourne then motioned from left to right across the formation, creating a 3Γ1 alignment.
The Vikings responded by having the safety over Bourne follow him to get more defensive backs to the 3-receiver side. The linebacker to the other side of the formation then traded places with him: