Skull crushers for certain...........I've decent tri's and I'm quit certain it's due to these.
As for the calves.........rest a bar across your shoulders, heavy as possible, and find something you can step onto like a 2x4 and go to down. Leg press can be used for calves as well. And you can form you own seated calve raise wiht putting the bar across your knees, albeit someowhat uncofortable.