From the moment we pick up a toothbrush in the morning, our hands go to work without a second thought. We turn doorknobs, tap and swipe across phone screens, twist the lids off water bottles, thread a key into the front door, and carry bags of groceries from the car. By the afternoon, some of us ask even more of our hands by wrapping our fingers around a tennis racket, a golf club, or a set of gardening shears. The hand is one of the most remarkable parts of our anatomy, yet it’s commonly overlooked until a task that used to feel effortless suddenly doesn’t. Most of us don’t think much about our grip until a heavy bag starts slipping out of our hands halfway across a parking lot or opening a mason jar almost makes us pass out from physical exertion. Appreciating the hand’s anatomy and how hand, wrist, and forearm-specific strength and conditioning can benefit our functionality and productivity can be a valuable part of staying productive throughout our everyday lives.
The hand’s framework begins at the fingers, the small bones known as phalanges, which bend and straighten at the knuckle joints where they meet the long bones of the hand called the metacarpals. Those metacarpals connect to a cluster of small wrist bones known as the carpals. This collection of eight small carpal bones meets the two bones of the forearm, the radius and the ulna, forming the wrist joint. This arrangement gives the wrist remarkable versatility, allowing it to bend forward and back, rock from side to side, and rotate. Powering the wrist joint’s range of motion is a network of muscles residing in the forearm, sending long tendons down through the wrist and into the fingers.
Both muscle groups run all the way from the fingers up toward the elbow, which is why forearm and hand strength are closely linked. The two largest groups of forearm muscles are flexors and extensors. The muscles running along the underside of your forearm are your flexors. The flexors curl the fingers and wrist inward, producing the grip that holds a toothbrush, closes around a railing, or grasps a jar lid. Now turn your hand over until you can see the backs of your fingernails. These muscles straighten or extend the fingers. These are your extensor muscles.
Rotation of the forearm brings in another pair of actions, supination and pronation. When the palm turns up, the forearm is supinated. An example of a supinated hand is the position of an upward rotated hand when holding a plate of food. When the palm turns down, the forearm is pronated. A simple way to remember it is that lying face-up is the supine position and lying face-down is the prone position. The palm follows the same logic. We utilize these rotating muscles constantly without realizing it, whether we’re turning a key in a lock, tightening a screw, or flipping a pancake.
Another valuable wrist movement is radial and ulnar deviation, which is the side-to-side hinge movement at the pinky and thumb side of the wrist. An example of radial deviation could be holding a cup in your hand and rocking your thumb upward toward your forearm. Dropping your pinky side down toward the floor is ulnar deviation. These small movements come into play every time we swing a hammer, cast a fishing rod, or hinge the wrist through a golf or tennis stroke, or throw a frisbee for our dogs.
When we appreciate that these muscles travel from the fingertips all the way up the forearm, it becomes clear why a little dedicated strengthening goes a long way. Simple, consistent resistance training, along with everyday habits like gripping and carrying objects around the house, reinforces the muscles from the fingers through the wrist and forearm. Understanding which muscles create each of these movements provides invaluable knowledge for building an efficient, effective routine that supports hand, wrist, and forearm function.
Our hands handle an extraordinary amount of work each day, from the first brush of the teeth in the morning to the last turn of a key at night. Strong fingers, wrists, and forearms are invaluable assets to an independent and active life, whether the goal is opening jars with ease or staying in the game on the tennis court. Perhaps we can take a little time to understand and care for these hardworking muscles so they continue to serve us well for years to come.
Sean McCawley, the founder and owner of Napa Tenacious Fitness in Napa, CA, welcomes questions and comments. Reach him at 707-287-2727, napatenacious@gmail.com, or visit the website napatenaciousfitness.com.