From Irv:
He comments,
The second and third frames in the second row are what IDU. If the Wizard is cheating, shouldn’t the beam and hangers be visible there as well as in the last frame? Otherwise, maybe he is cheating and conjures the beam and hangers to “prove” he wasn’t using magic in the previous frames even though he was? All told, IDU what’s going on here.
For that matter, if there’s some magic making the beam and hangers invisible that he somehow forgets? turns off? for the last frame, how did he appear to lift it off the ground??
Comics I Don't Understand 
Didn’t we do this one on November 11?
And then there’s the shrinking personal trainer….
Mark H.: Yes, we’re doing a second rep.
Comics I Don’t Understand — WordPress.com
Yes, the Wizard is cheating.
No, he’s not using magic. At least not “magic” magic. Just smoke ‘n’ mirrors.
You just don’t see his cheating method until the last panel.