Can you be too flexible: the hypermobility risk

Mobility, done well, is range you can actively control. You reach a deep position, and you can produce force and stay stable there. Hypermobility is different. It is range that goes beyond what is typical, often without the strength and control to own it. A joint that hyperextends past straight is not necessarily strong at that end. It is just loose there.

This is why being very flexible is not automatically an advantage. If your elbows or knees bend backwards past straight, or your shoulders slip into positions most people cannot reach, you may be relying on the joint's passive limits rather than muscular control. Under load, that is where things get irritated or, occasionally, injured.

The standard quick screen for generalised joint hypermobility is the Beighton score, a nine point check. A clinician looks at how far certain joints bend and adds up the points. It is a screening tool, not a diagnosis on its own, but it gives a sense of whether your joints move more than typical.

As a general guide, a score of 5 or more out of 9 suggests generalised hypermobility in adults, with a lower threshold used for children before puberty and a lower one again for adults over 50, because range tends to decrease with age. If that sounds like you, it is worth knowing, but it is only a starting point.

For plenty of people, being hypermobile is just a quirk. For others, it comes with real trouble: joints that ache after activity, that feel unstable, that partly slip out of place, or that get injured more easily than they should. In some cases, hypermobility is part of a broader condition that a doctor needs to assess and manage.

• Joints that give way or partly dislocate. A knee, shoulder, or ankle that slips or buckles is a reason to get it checked, not to push through.
• Pain that clusters around your loosest joints, especially after activity, rather than the normal muscle soreness of training.
• Frequent sprains and strains from movements that would not usually cause them.
• Symptoms beyond the joints, such as easy bruising, unusual fatigue, or skin that stretches more than typical, which are worth mentioning to a doctor.

If you are hypermobile and mostly pain free, you can absolutely train, and strength training is one of the best things you can do. But the usual advice gets flipped. You do not need more range. You need more control of the range you already have. The goal is strong, stable joints, not deeper stretches.

1. Prioritise strength and stability over stretching. Build muscle around loose joints. Controlled strength work through a normal range gives you the stability your passive tissues do not provide on their own.
2. Stop short of your extreme end range under load. Just because your elbow or knee can hyperextend does not mean you should lock into that position with weight. Keep a small bend and stay in a range you can control.
3. Go easy on aggressive passive stretching. Cranking an already loose joint further tends to make things worse, not better. You are rarely short on range. Spend that time building control instead.
4. Progress load slowly and watch the joint. Add weight gradually and pay attention to how the joint feels the next day. Hypermobile joints can tolerate less abrupt loading, so patience pays off.