The Seated calf raise or heel raise is used to strengthen the Soleus muscle, the athlete performs a heel raise in a seated position. Bending the knee relaxes the overlying Gastrocnemius. A bar weight can be added to the thighs to increase difficulty.
For more information on ankle rehabilitation and exercises visit:
https://www.sportsinjuryclinic.net/ankle-pain
For more information on knee pain visit:
https://www.sportsinjuryclinic.net/knee-pain