COLUMBIA, S.C. (AP, WLTX) - The San Francisco 49ers have signed running back Marcus Lattimore to a four-year contract.

The team announced the move Friday afternoon. Exact terms were not disclosed by the team.

Meanwhile,Lattimore says he's feeling stronger each day as he continues his recovery from a serious knee injury with the San Francisco 49ers.

Lattimore spoke to The Associated Press by phone about his rehab and said the most difficult part has been doctors and trainers slowing him down from overdoing things. Lattimore still believes he can be ready to play this fall, but is content to follow doctors' orders.

Lattimore says he's partnered with First Choice by Select Health of South Carolina to encourage teens and young people on regular medical visits, even without serious issues like Lattimore has had during his college career.

Lattimore tore the ACL in his left knee as a sophomore. He discloated his right knee and tore several ligaments last season.

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