As a rider with just one hand, standing up on the pedals is doable, but I can't transfer any meaningful power. On the road, I only do it for butt relief.

On a trainer, however, I can stand and lay down major power.

Since standing is not something I can duplicate in the real world, does it make sense from a muscle development standpoint to do trainer intervals while standing, or am I better off doing intervals from a position that I will use on the road?