Corrected entry: Most of the wolves have visible make-up lines on their stomachs to create a "six-pack" effect. Most notably is Sam and his love handles when he is turned to the side and there are no muscle bulges just the demarcated lines.
huntergal
5th Jan 2010
Correction: Shadows and flab, not makeup. The actors were given a trainer to help them prepare. They have some flab on top of their six packs because they didn't work out as intensively as Taylor, but they aren't fake.