Yes, they do. https://eastpointehealthandfitness.com/farmers-carry-a-full-body-strength-exercise/#:~:text=Farmers%20carries%20are%20debatably%20the,almost%20everyone's%20every%2Dday%20life.&text=This%20exercise%20also%20improves%20posture,bone%20density%2C%20and%20core%20strength.