Thor understands this. The guy's a former competitive bodybuilder, and he's been spicing up his shows with ESPN-worthy feats of strength for years: tearing through phone books, bending iron bars, smashing cinder blocks across his chest, and on and on. Even though he's middle-aged (he began performing in the mid-'70s), he hasn't given up the flexing and grunting.
The thing is, though, Thor brings the rock too. His new album, Thor Against the World, is a little less overtly metal than earlier releases; this time out, he's going for a '70s glam/hard-rock feel, and he nails it. His vocals might be a little limited, but the riffs are as solid as the cinder blocks he crushes onstage.