The San Francisco 49ers have one of the most electrifying players in the NFL in Christian McCaffrey—but even the best need a breather. After ranking second in the league with 311 carries last season and adding 102 receptions, McCaffrey's workload is raising eyebrows. Enter rookie running back Kaelon Black, a third-round pick from Indiana, who the 49ers hope can lighten the load and keep their star fresh for the long haul.

Black, 24, brings a blend of experience and grit after six collegiate seasons. Standing 5-foot-9 and 211 pounds, he rushed for a career-high 1,039 yards and 10 touchdowns in 2025. Head coach Kyle Shanahan sees more than just a backup in Black. "It always starts with me with just who's the most natural running back," Shanahan said. "I love third-down backs, all the pass game stuff that people can bring, but when it just comes to running the ball, you need to have more than one starter."

Shanahan describes Black as a "tough, hard-nosed runner" who can also contribute in the passing game, despite limited targets at Indiana. "What he could do as a true starting running back is what I liked," Shanahan explained. "If you ever had to give him more carries, could he hit the right hole? Can he move the chains when you only block it for three? Can he get five? The physicality he ran with, how he broke tackles when he did get into space, how he didn’t sit there and stutter his feet, he just broke to open spots and got yards."

With McCaffrey approaching 30 and a history of injuries—he played just four games in 2024—the timing couldn't be better for the 49ers to invest in their future backfield. Black might just be the fresh legs that keep San Francisco's offense rolling while preserving McCaffrey's explosive playmaking for when it matters most.