All Of the above works, now heres another way First we need to understand the mechanics of this muscle
The calves are an entirely different muscle,since they get worked every day ,walking,jumping,etc-so here we have to introduce them to the "Shock" Value.
Buy a chain at any hardware store about 6to7 feet in length is sufficent add a clip on lock hook to each end.
Now wrap the chain around your waist and lock in place grab a plate 25,35,45 whatever it takes to run the chain thru the hole (olympic plate) You will have to get on your knees to do this then hook the plate where it hangs just low enough that it's just above the knees, do free standing calf raises with a weight that you can rep 100 times without stopping you may hold on to a pole or side of a maching for stability,2nd set try for another 100 if you can't thats ok, be sure to use strict form with no bouncing.
I Forgot To add its more confortable if you have a weight belt,that way you only need 3 ft of chain.S hooks will work also.
RADAR