Lower body flexibility programme
Understanding your hamstrings: What they do, why they tighten and how to care for them
Nicola Tik
July 1, 2025

The hamstrings are a group of three muscles that run down the back of your thigh. They connect your pelvis to the lower part of your leg, just below the knee. These muscles help bend your knees and extend your hips, which means they play a major role in walking, running, squatting and getting up from a chair.

But when they are tight, they can cause more than just a tug in the back of the leg. Tight hamstrings can:

Why do hamstrings get tight?

Tightness does not always mean a muscle is short. It often means the nervous system is protecting that area or that the muscle is under constant tension. Common causes of hamstring tightness include:

What can you do beyond stretching?

Stretching helps, but it is only one part of the picture. If you want lasting changes, combine stretching with these strategies:

In short:

Tight hamstrings are not just a flexibility issue. They are often a sign that something else in your movement system needs attention. By understanding how they work and supporting them with movement, strength and recovery, you are not just stretching a muscle, you are creating better balance and ease throughout your whole body.