Repeat steps 1 through 4 until you have completed the desired number of seated calf raise repetitions before resting. (shapesense.com)
The soleus is essential for jumping and you can target it by doing seated calf raises. (fitnessandpower.com)
A good way to start is by performing seated calf raises — this is a highly effective exercises that gives you the opportunity to safely overload the muscles with heavy weight without placing undue stress on your back. (fitnessandpower.com)