Thor was not nearly that uninspired. There were no laps around the training area for the acolytes under his training regimen.
Instead, he brought out a number of weighted vests, made of Rae's silk, and had the trainees do sprints up and down the bleachers while he kept a milder version of [Refreshing Lightning] active so that the muscles had time to strain, heal and repeat.
If he kept too powerful of a spell active, they didn't suffer the strain needed to grow the muscles, but this way they should get the gains in a single morning that would otherwise have taken them months.
Thor was very proud of the plan, but Karl noticed that he put a stronger version of the regenerative spell on the Cerro Hatchlings, who were happily chasing everyone up and down the stairs.
They didn't need the work to grow up big and strong, they needed higher quality feed and a good smashing post to practice their skills. Chasing the herd was just fun.