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Knees are delicate joints, which is why yoga teachers tend to go on (and on!) about correctly aligning the knee in yoga poses. Unlike hips, which can move in many directions, knees are designed only to move in one direction. So when we do yoga poses, it's important to respect the way that knees are designed to move, otherwise we risk injuring this relatively delicate joint. Knees are hinge joints, designed to move on a single axis, just like the hinge of a door. And just like a hinge, they are especially vulnerable if you twist them away from that axis.

In standing poses where the knee is bent, correctly aligning the knee is especially important because the knee joint is bearing weight. In poses where the hips are facing forward, the body finds a safe alignment fairly naturally, just as it does every day when we walk or run. However, in poses such as Warrior II and extended angle pose (and Warrior I to a lesser extent), we put the body in an un-natural stance, with the pelvis facing sideways and the front foot facing forwards. When we then bend the knee, our body often comes out of its safe alignment, for a number of different reasons (stiffness in the hips, short adductor muscles, distraction…).

You'll often hear teachers cue "bring your knee over your ankle" to try and correct for this. But we all know that bringing the knee directly over the ankle in these poses can take years of practice! Instead, don't worry about how far forward your knee is: check the alignment of your knee by thinking about lining up two straight lines. The first (in pink) is a line that goes through the middle of your foot: approximately from the base of the second toe to the middle of the heel. The second (in blue) goes from your hip socket in the middle of the upper thigh to the middle of the kneecap. When those two axes are in line, you are good to go!

The pictures below hopefully makes it pretty clear. In 1) and 2) I've shown two common mis-alignments that I often see in class, just to help illustrate the point. 3) shows what it should look like.

(PS: You usually can't see your foot from standing in Warrior II, so lean forward to check your alignment, and then straighten up again).

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On a previous Yoga Tip, a reader left the following comment: "I'd love some tips on how to keep a straight leg without locking the knees in balance poses."

This is an excellent question! Many of us have probably heard yoga teachers talk about the importance of not locking the knees in standing and balance poses.  Without going into too much anatomical detail, this is important for the following reasons:

• If your knee is locked in a balance pose, it means that the joint is holding the weight of the body, instead of the muscles. In the long run, this can wear down the protective cushioning around the knee (called the meniscus) and cause wear and tear on the joint, which can lead to pain, injury and possibly conditions like arthritis.
• If your knee is locked in a weight-bearing standing pose, for example triangle pose, the joint is again at risk, but in addition, because you are now stretching as well as bearing weight, the ligaments and tendons surrounding the knee joint are also at risk of taking the strain of the stretch, instead of the muscles. Since ligaments and tendons are meant to stabilise, not to stretch, this can quickly lead to injury - and a torn or injured ligament takes far, far longer to heal than a similarly injured muscle.

1. Begin in a standing pose with a neutral pelvis.
2. Establish an even weight distribution between the outer edge, inner edge, and heels of your feet, lifting your toes up to do so if it helps. Press strongly through the big toe mound in order to lift your arches.
3. Keep that engagement and then without moving your feet, try to engage your muscles as if you wanted your toes to lengthen forwards and your heels to draw back.
4. Next, imagine your shins drawing forward.
5. Now, engage your muscles as if to squeeze an imaginary yoga block or tennis ball in between your thighs, lifting your kneecaps upwards and drawing the thigh muscles up and back.
6. Finally, engage your muscles as if you wanted to lift your pelvis away from the tops of your femurs. This one is tricky - just visualise it, even if you can't feel anything happening.

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