But his arms, taking most of the strain, were already aching.

In that part of me, my arms ache to hold her.

His arms were aching now, but he was calm once more.

His arms ached with the effort, but he made himself go forward.

My arms did not ache even as the hours passed.

The following day my arms are aching, which means it must have done me some good.

Her arms ached from effort but she gave them no rest.

Her arm still ached from the exercise of the night before.

She'd carried it until her arms ached so much she couldn't go any further.

What's more, his arms were aching from all that page turning.