Shoes have heels for a combination of reasons that stretch back over a thousand years: stability on horseback, shock absorption on hard ground, reduced strain on the calf and Achilles tendon, and, eventually, fashion. The answer depends on what kind of heel you’re talking about, because the low block heel on a work boot serves a very different purpose than a three-inch stiletto or the cushioned wedge on a running shoe.
The Original Purpose: Staying in the Stirrups
The earliest heeled shoes were purely functional. In the 10th century, Persian cavalry soldiers discovered that a raised heel helped lock their feet into stirrups, giving them the stability to stand up and shoot arrows while riding at full speed. Archaeological evidence from the era of the Samanid Empire (874–1005 CE) in what is now Iran shows soldiers wearing early versions of heeled riding boots. The heel acted as a wedge against the stirrup, preventing the foot from sliding forward under the force of a galloping horse.
From Persia, heeled footwear spread to Europe in the late 1500s and 1600s, where it was adopted by aristocratic men as a symbol of military power and wealth. The fashion eventually crossed gender lines, and the practical cavalry boot evolved into the ornamental court shoe. But the original engineering logic, using a raised platform to brace the foot against something, never went away. It’s the same reason cowboy boots still have angled heels today.
How a Heel Changes Your Body Mechanics
Even a modest heel reshapes the way your body distributes weight. When you stand barefoot, roughly 30% of your body weight sits on the ball of your foot and 70% on your heel. Raise your heel by about three inches (7 cm), and those numbers nearly flip: studies in the Journal of Physical Therapy Science found that forefoot pressure jumped to 76–77% in standard high heels, meaning the ball of the foot absorbs more than twice the load it was designed for.
That forward weight shift triggers a chain reaction. Your center of gravity moves forward, your knees and ankles work harder to compensate, and your hip motion changes. A systematic review published in BMC Musculoskeletal Disorders confirmed that the biomechanical changes from high heels concentrate mostly in the knee and ankle joints, with a significant increase in hip range of motion during walking. Interestingly, the same review found that high-heeled walking can actually decrease the curve of the lower spine, contrary to the popular belief that heels always exaggerate a swayback posture.
Work Boots and Shock Absorption
Outside of fashion, heels serve a straightforward structural role in work footwear. Logger boots, lineman boots, and other heavy-duty styles typically have a raised, underslung heel between one and two inches tall. The elevated heel does three things at once: it supports the arch (which acts as the foot’s natural shock absorber), it cushions the heel strike when walking on hard surfaces like concrete, and it gives extra ankle stability on uneven or steep terrain. For someone climbing a hillside or standing on a steel beam, that inch of heel height translates directly into less fatigue and fewer rolled ankles.
This is also why completely flat shoes aren’t always ideal for people who spend long hours on their feet. A small amount of heel elevation reduces the stretch demand on the Achilles tendon and calf muscles, which is why many occupational shoes and even therapeutic insoles include a slight lift.
The “Drop” in Running Shoes
Modern athletic shoes use a version of the same principle, measured as “heel-to-toe drop,” the height difference between the back and front of the shoe. A typical running shoe has a drop of 8 to 12 millimeters, meaning the heel sits about a third of an inch higher than the forefoot. A higher drop puts the foot in a slightly pointed-down position, which reduces the range of motion your ankle needs and takes strain off the calf muscles. A lower drop (or zero drop) requires your calf and Achilles tendon to do more work with every stride.
Neither is inherently better. Runners who already have tight calves or Achilles issues often do well with a moderate drop because it shortens the lever arm those tissues have to manage. Runners who want to strengthen their lower legs or prefer a more natural foot position gravitate toward low-drop shoes. The key point is that even in a shoe that looks flat, the heel is doing biomechanical work.
Therapeutic Heel Lifts
Doctors sometimes prescribe a small heel insert, typically just a few millimeters thick, to treat conditions like plantar heel pain and Achilles tendinitis. The logic is simple: a slight heel elevation plantarflexes the foot (points it gently downward), which slackens the plantar fascia along the bottom of the foot and reduces the pull on the Achilles tendon. Clinical guidelines support heel lifts for a range of lower limb musculoskeletal conditions, making them one of the more common conservative treatments before anything more aggressive is considered.
What Happens When Heels Are Too High
The benefits of a modest heel start to reverse as the height increases. Women who regularly wear high heels can develop a measurable shortening of the Achilles tendon over time, with both the height of the heel and the duration of wear contributing to the change. The classic sign is discomfort when switching to flat shoes, because the shortened tendon is being asked to stretch further than it’s adapted to. Calf stretching exercises can help reverse this, but the process is gradual.
Balance also deteriorates. The same meta-analysis that mapped how heels change gait mechanics confirmed that high heels impair both static and dynamic balance, increasing the risk of falls. The higher the heel, the more the body’s center of gravity shifts forward, and the smaller the base of support becomes, especially in narrow or pointed styles. This is a compounding problem: the forefoot absorbs more pressure while simultaneously having less surface area to stabilize you.
For everyday wear, keeping heel height between one and two inches provides some of the functional benefits (arch support, reduced Achilles strain, shock absorption) without the steep trade-offs in balance and forefoot pressure that come with three inches and above.