Your hamster is a fatty. Just look at him, sitting in his cage, nibbling his pellets. He might as well be eating a cake with his bare hands on the couch in front of the TV. He needs to get some exercise, otherwise the lady hamsters will never show him any love.
Get involved in your hamster's exercise regiment with the hamster wheel pedometer. It handily counts how many times your little friend has run around his wheel, giving you a precise readout of just how far he's gone. I recommend at least 5 miles a day, plus a strict regiment of push ups and sit ups. That should be enough to give your hamster the beach body that he's wanted for oh-so-long.