Jamaal Charles admitted he felt frustrated by injuries in 2014.

Charles’ troubles began at the conclusion of training camp in St. Joseph, Mo. He twisted an ankle when he stepped off a curb he didn’t see while carrying a box from the dormitory at Missouri Western State University.

“I feel good,’’ Charles said. “My body has healed up, rested up.

“I was frustrated more last season as I’ve ever been because of all of those injuries. I was frustrated because I didn’t feel my body was right the whole season. But I battled through that time. That’s all I could do. I felt like I was in a fight and I had to respond. I had 12 weeks to finish the season, and it felt to me like I had 12 rounds to go.’’

Charles missed just one game, but missed a lot of practice time.