Theo watched as Ruby dipped into the foam selection available to them using her powers and he figured this was as good a training simulation as any with less chance of physical harm. Plus she got to stretch her powers and Theo did not, for him it was all about what he could do without his powers.
If he wanted to push his powers he'd be in the hologym but he knew the importance of being able to rely on more than just your abilities, especially in the field.
"Ready," he affirmed as he braced himself on the mats and watched the foam projectiles while also keeping Ruby in his peripheral vision because the movement of the foam went beyond the projectiles themselves after all, they weren't moving on their own after all.