The race has one
lunge station. You do hundreds.

A badminton lunge puts something like six to twelve times your body weight through the achilles tendon. A race adds a hundred metres of lunging under a sandbag. Both are reasonable. On consecutive evenings they are not.

Here is what the published research says about both, where a badminton week and a race block genuinely collide, and what a week that holds them together looks like. Every figure below links to its source.

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The lunge is the whole sport, and it is expensive.

A systematic scoping review of lower limb biomechanics in the badminton lunge describes a movement of rapid forward acceleration followed by an abrupt single leg deceleration, over a very short stance phase. The measured cost is high: impact loading up to around 2.5 times body weight through the limb, force through the achilles tendon of roughly six to twelve times body weight, and around five times body weight through the patellar tendon.

Those achilles and patellar figures are tendon forces, not ground reaction forces, and the distinction matters: a tendon multiplies the load that crosses it because of the angles it works at. It is why a sport played in trainers with a light racket produces the tendon problems it does.

The injuries follow the mechanics. The same review reports the knee and ankle as the principal sites, with incidence across the studied literature ranging from about 63 to 92 percent. That range is very wide, and we are quoting it as a range on purpose, because it reflects different populations and definitions rather than a number that applies to you personally. The direction is not in doubt even if the magnitude is.

The race asks for the same tendon, on purpose.

A HYROX race is eight one kilometre runs, each followed by a station: SkiErg, sled push, sled pull, burpee broad jumps, row, farmers carry, sandbag lunges, wall balls. Three of those land on exactly what badminton already spends. The burpee broad jumps are eighty metres of jumping and landing. The sandbag lunges are a hundred metres at 20 kg for men or 10 kg for women. The running is eight kilometres.

The first published physiological study of the race followed 11 recreational athletes through a full simulation. Median finish was 86 minutes, of which 51 were spent running, and what predicted finishing time was aerobic capacity. That is the gap badminton leaves: a court sport with rallies and pauses develops the ability to repeat efforts, not the ability to sustain one.

Where each side puts its load. The three rows marked on both sides are where a badminton week and a race block quietly compete for the same tissue.

Where the two actually collide.

Not in theory. On specific days, in specific tissue. Three collisions do most of the damage.

The achilles, loaded twice in forty eight hours

This is the collision that defines the pairing. Your court night puts six to twelve times body weight through the achilles, repeatedly. A burpee broad jump session is eighty metres of jumping and landing. A sandbag lunge session is a hundred metres of loaded single leg deceleration.

Any one of those is a normal training stimulus. Two of them inside forty eight hours is how an achilles that was merely stiff becomes an achilles that stops you playing. Tendon needs longer between heavy loads than muscle does, and the plan has to know which nights you play to respect that.

The lead knee

Every lunge loads one knee much harder than the other, and in badminton it is usually the same one, session after session. The review puts around five times body weight through the patellar tendon in a lunge, and reports that fatigue makes the mechanics worse rather than better.

The race then asks that knee for a hundred metres of lunging and a hundred wall balls, the second of which arrives when you are too tired to hold a good position. That is the same tendon, on the same side, at the end of the session.

The lunge written twice

A generic race plan programmes lunges because the race has a lunge station. That is correct reasoning and the wrong conclusion for you. You do not need to be taught to lunge; you need the tendon capacity to survive the volume you are already doing plus the volume the race adds.

So the plan spends its strength slots on the hinge, the carry and the sled, which the race needs and badminton has never given you, and builds achilles capacity deliberately rather than adding more of what your sport already does.

Each one is the other’s blind spot.

What badminton will not give you

Strength, and a sustained engine. Nothing on a badminton court is heavy, and rallies with pauses between them build recovery rather than endurance. A 152 kg sled and two hundred metres of farmers carry are genuinely new experiences, and so is running for ninety minutes without a let.

What HYROX will not give you

Anything overhead at speed, and anything wide. A race plan runs forwards and lifts in straight lines. Train only that and you return to court with a shoulder that has not smashed in twelve weeks and hips that have forgotten how to reach sideways for a drop shot.

Which is the real argument for one plan rather than two. Two plans written separately do not know about each other; they just take turns using the same achilles.

What your plan does about it.

Tell Smash Coach you play badminton and your court nights go in first, as the hard days they are, with the race training built around them. Concretely:

Calf and achilles capacity

Progressive loading for the tendon your sport taxes hundreds of times a session and the race then asks for eighty metres of jumping on. This is the single most important line on this page for a badminton player.

Deep lunge strength and control

Strength through the range your sport actually uses, built under control rather than under a shuttle. The pattern is already yours; the capacity to repeat it under fatigue is what the plan adds.

Plyometrics moved off court days

No heavy calf or jumping work the day before you play, and never the day after either. Tendon takes longer to recover than muscle, which is why this rule is stricter than it looks.

Lateral hip strength

The muscles that hold a knee steady as you push off sideways to the net or the rear corner. Running in a straight line never trains them and badminton demands them constantly.

Shoulder and forearm care

External rotation, scapular strength and wrist work for the smashing side. The race never puts anything above your head except a wall ball, so it will not prepare that joint for you.

Strength spent on the hinge

Deadlifts, carries and sled work rather than more lunges. The plan deliberately puts its strength slots where the race needs them and your sport has given you nothing.

The same week, written twice. Court nights are fixed points, and the race work beside them deliberately loads different tissue. Change a club night in the app and the week is rebuilt around the new one.

Keep the badminton. Race anyway.

Tell Smash Coach which nights you play, what you are training for, and anything that currently hurts. Your first week is built around your actual schedule in minutes.