Thews and sinews are synonyms that refer to the strength and resiliency of the human body. Thews are the muscles and tendons that provide the body with strength and power, while sinews are the flexible, cord-like tissues that connect muscle to bone. These terms are often used interchangeably to describe the physical power and might of a person or animal. Other related synonyms include musculature, brawn, and vigor. These words evoke the idea of physical prowess and vitality, reminding us of the importance of exercise and conditioning for maintaining a healthy body and mind.