Angels star Mike Trout suffers from a back injury every day.

Mike Trout continued to make progress in his recovery and return from back injury.

On Thursday, Angels Athletic coach Mike Frostad said center fielder began his rotation job on Wednesday. This job includes exercises designed to strengthen his muscles in preparation for eventually swinging the bat.

“Mike is doing well,” Frostad said ahead of the Angels’ morning game against the Oakland Athletics. “He is progressing as we expected and right now he is just continuing with his program. Everything looks good.”

There is no timeline for when he will start swinging the bat as his return is processed day by day. The Angels also did not discuss the task of rehabilitating Trout.

“He feels good, this is the best thing right now,” Frostad said. “He comes back after that first day [of rotation work] and he’s doing well.”

Trout will not be with the team for the road series against the Seattle Mariners. He will continue his program and do the work at the Angel Stadium.

Trout has not played since being pulled from a game against the Houston Astros on July 12 with back spasms. Later that week, he was placed on the 10-day injury list for inflammation of his left chest, and on July 21 he was given a cortisone injection to ease the discomfort and aid in the healing process.

He visited a spinal specialist who said the Angels star had T5 costovertebral dysfunction, which the team announced on July 27. The term “injury” refers to a joint connected to a rib in the thoracic spine that has become inflamed.

Trout and team aren’t sure what caused the injury. He suggested that the burst of swings he made between indoor batting cages and outdoor training was a major factor – overuse of the joint can cause it to become inflamed.

Shohei Otani “okay”

Shohei Otani was in the starting lineup on Thursday, finishing second as the designated hitter.

On Wednesday, Otani was pulled ahead of a hit in the seventh inning with a forearm cramp in his right hand he felt when he grabbed the bat near the end of the game.

“It’s all right,” Frostad said of Otani on Thursday. “It was a precautionary move last night and everyone checked out and he’s on the roster today as DH so it’s all good… There’s very little concern on our end.”

Interim Angels manager Phil Nevin plans to give Ohtani a day off for the rest of the week.