The San Francisco 49ers' backfield has taken some injury hits in training camp with Kendall Hunter (knee) being lost for the entire season and LaMichael James (elbow) being lost for the preseason.However, the team is enjoying seeing one player in the backfield regaining his health. Fullback Bruce Miller looks to be his typical stout self this summer after being lost for the season in December after breaking his scapula in Tampa Bay in Week 15.Quarterback Colin Kaepernick said Miller's health is vital to the offense.