Grab Hold
Whoa, look again. Though this looks like a giant hand has taken a hold of this man, the reality is that it's just another t-shirt illusion.
Still, though, he doesn't look very relaxed or comfortable in this position. His waist is being gripped by an imaginary giant, which has got to be a weird position to be in. However, it does make his core look slim. Diets? Not necessary.