Also, if there is a leg press machine, you could use that. Just put the balls of your feet on the bottom edge of the platform. This style of calf raises gets mine super pumped and tight every time. You could also do one at a time, standing up (on a stair or something similar). The seated calf raises (bent knees) only work the soleus any how. Vary it up...you can literally do calf raises almost anywhere. Squeeze the ever loving dog sh*t out of them! and smash the volume (at least 20-25 reps as they are made up mainly of slow twitch muscle fibers). Rinse and repeat lol.