Yes, the Prithvi Mudra is associated with strengthening the mind. In addition, there are other mudras like the Prana Mudra which are associated with vitality. The Ganesh Mudra is known to remove obstacles. Kali Mudra helps to overcome difficulty, while Anjali mudra is used for peace. Linga Mudra on the other hand is for strengthening and firming your lungs and limiting respiratory problems.