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How to build calf muscle without equipment
Do double-leg calf raises.
This is a classic exercise for toning and strengthening the calf muscles. This workout utilizes your own body weight instead of a weight machine to help build muscle mass.
It strengthens both the gastrocnemius and soleus muscles. To start off, you will need to stand near a wall to balance yourself, if needed, and your feet should be hip-width apart with your ankles, knees and hips vertically aligned.