Work up a sweat with this collection of free video preview clips and galleries by XcoMedia, including some particularly hot ones of dumbell dreamboat Mark Dalton. (And yes, we are on a musclehead kick this week - thanks for noticing. We promise to get back to a regular balanced diet of twinks and sexy beer guts soon.)

XcoMedia: Video Previews and Mark Dalton Gallery (.mov clips and photos at XcoMedia.com)

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