Calves are often overlooked in calisthenics, but they matter. Every squat, lunge, and jump demands them. The gastrocnemius crosses the knee, so it works best with straight legs. The soleus works with bent knees. Train both with calf raises, jumping variations, and single-leg work. Strong calves absorb impact and generate explosive power. Weak ones limit your lower body potential. They respond to high volume and frequency.