Why groin problems build up quietly

Groin injuries have a reputation for being mysterious. They are not. They are among the most predictable injuries in football, because almost nobody gets one without weeks of warning first.

The warning is just very easy to ignore, because it does not feel like an injury. It feels like being a bit stiff in the morning.

What the adductors actually do

The muscles on the inside of your thigh are not there to bring your legs together. In football they do something much harder.

Every time you plant a foot to change direction, your adductors are working against your leg being dragged outwards. Every time you strike a ball across your body, they are decelerating your hip. Every time you lunge into a tackle, stretch for a pass, or stop suddenly, they are absorbing load while lengthening.

That is the pattern behind most muscle injuries: producing force while being stretched. It is the same mechanism that tears hamstrings, and for the same reason, it is the same thing that protects them.

Why it builds up

Groin problems are usually an accumulation rather than an event.

The load goes up. Preseason starts, or the fixtures get denser, or you switch to a harder surface, or you start playing a position that cuts more. The tissue does not adapt as fast as the demand rises.

Then a small amount of pain arrives. Not enough to stop, just enough to notice when you get out of bed or when you strike a long ball. You keep playing, because it is not an injury, it is just tight.

And then one day it stops being tight and starts being torn.

The warning signs, in order

These usually arrive in this sequence, over weeks:

• Stiffness in the morning that clears once you are warm
• Discomfort when you strike a ball across your body
• Discomfort on the first few sprints, that eases as you go
• Pain that does not ease as you go
• Pain that is there the following morning

By the time you are at the last two, this is an injury being managed rather than a problem being prevented. The first three are the window.

What actually protects them

Copenhagen planks. The single most useful exercise here. Side plank position, top leg supported on a bench or a partner, lifting your body with the inside of your top thigh. It loads the adductors while they lengthen, which is precisely the demand that hurts them on the pitch.

Start with your knee supported rather than your foot. Two sets of six on each side, twice a week, is a real dose. It is unpleasant and it takes four minutes.

Adduction squeezes. A ball between the knees, squeeze and hold. Useful early, useful when something is already sore, and useful as a way to test where you are: if a squeeze hurts, you have your answer.

Single leg work generally. Split squats and lunges load the whole system in the position it actually fails in.

Something for the hip that is not adductors. The muscles on the outside of the hip work with the ones on the inside. Training only one half of a pair is how you create the next problem.

The thing most players do instead

They stretch it.

Stretching a sore adductor feels productive and does almost nothing for the underlying problem, which is that the muscle is not strong enough for what is being asked of it. A stretched weak muscle is a weak muscle that has been stretched.

Stretching is not harmful here. It is just not the treatment, and the time spent on it is usually time that was available for the thing that would have worked.

When to stop and ask someone

Groin pain has more possible causes than most areas. Hip joint problems, hernias and bone stress all present in roughly the same place, and none of them gets better with Copenhagen planks.

Go and get it looked at properly if:

• It is not settling after two or three weeks of sensible loading
• It hurts at night or at rest
• It hurts to cough or sneeze
• It came on with no obvious increase in training

The rule that applies to every muscle injury applies here too: cleared to play and ready to play are two different things.

The short version

Four minutes, twice a week, of an exercise almost nobody does. Started before anything hurts, not after.

That is close to the whole answer, and the reason it does not happen is that the warning signs do not feel urgent until the week they become an injury.