I use to do this workout over the summer and it really helped me. You can do seated, standing calf raises, or calf press.

You start off with you feet straight out and rep it out til failure, then move your feet inward and go til failure, turn your feet outward and go until failure. That is one set. You can add weight if you want but I found that it works just as good using the same weight. Do three sets of this and you calves should be burning.

Let me know if it works.