You get hurt stopping, not starting

Watch the replay of almost any non contact injury in football. The player is very rarely accelerating. They are slowing down, or landing, or planting a foot to turn.

Everyone trains the first half of that. Sprints, jumps, acceleration work. Almost nobody trains the half where the injuries actually happen.

Why braking is harder than accelerating

When you accelerate, your muscles shorten while producing force. That is the comfortable direction, and it is limited by how strong you are.

When you decelerate, your muscles produce force while being lengthened by your own momentum. The forces involved are considerably higher than in acceleration, and they arrive faster.

Stopping from a sprint can put several times your body weight through one leg in under a fifth of a second. Landing from a jump is the same problem with less warning.

So the tissue is being asked for its highest output in its least favourable position, usually while you are looking at a ball rather than at the ground. That is the injury mechanism for most knee and ankle problems in this sport.

What good braking looks like

You can see it without any equipment.

The foot lands under the body. A foot that lands well out in front is a brake applied through a straight leg, and a straight leg has no way to absorb anything.

The knee bends and tracks over the foot. Not caving inwards. That inward collapse is the position most knee injuries happen in.

It takes more than one step. A player who stops in one violent step is putting everything through one contact. A player who stops in two or three is spreading the same load.

It is quiet. This one is genuinely useful and costs nothing to check. A loud landing is a landing with no absorption in it. Ask a player to land quietly and most of the mechanics fix themselves.

How to train it

The work is not complicated, and it takes very little time. What it needs is to be done regularly and done fresh.

Landings

Start by dropping from a low box and holding the landing. Not jumping, just landing and stopping dead in a good position for a second.

Progress by raising the box a little, then by landing on one leg, then by landing and immediately going somewhere.

Quality is the whole point. Six good landings beat thirty sloppy ones, and once they are sloppy you are training the pattern you are trying to remove.

Decelerations

Run at maybe seventy percent for ten metres, then stop under control in a marked area. Then from further. Then faster. Then stopping and turning rather than stopping and standing.

Cutting

Once stopping is solid, add the change of direction. Plant and go at forty five degrees, then ninety, then further. Off both feet. Eventually with something to react to, because in a match you are never the one choosing.

Where it goes in a session

At the start, after the warm up, while you are fresh. This is skill work rather than conditioning work.

Done at the end of a session, when you are tired, you will practise exactly the mechanics you are trying to eliminate. Tired players land stiffly and let the knee collapse inwards, which is the whole problem.

Ten minutes, twice a week, before the heavy work.

Who this matters most for

Players growing quickly. A body that has changed length in six months is working with a control system that has not caught up. That is a large part of why knees hurt during a growth spurt.

Anyone coming back from an ankle or knee problem. The joint's sense of its own position takes longer to return than the strength does, and landing work is how you rebuild it.

Wide players and anyone who cuts constantly. More changes of direction per match means more exposure to the exact moment things go wrong.

The thing worth remembering

Football is not a sprinting sport. It is a stopping, turning and starting sport, and the stopping is where the season gets lost.

Two of the three get trained everywhere. The one that hurts people gets trained almost nowhere, and it is the cheapest ten minutes in the week.