Most people don't realize the bone in your lower leg, the tibia, aka the shin, needs to rotate.
And this matters more than you think.
The tibia needs to move internally and externally for your knee, hip, and foot to function the way they were designed to.
A shin bone that doesn't turn properly can lead to dysfunctions up and down the chain, including hip, lower back, and even neck problems.
But for grapplers, it may be even more important.
Here's why.
TIBIAL ROTATION AND WHY IT MATTERS
The tibia rotates internally and externally as part of normal knee and hip function. When that rotation is free and available, your leg has room to move inside a leg entanglement like when stuck in Inside/Outside Ashi or the Saddle.
You can buy time, reposition, and find your escape.
When it's restricted, the joint hits its end range faster. Pressure builds quicker and your window to work shrinks. You end up tapping before you actually run out of options.
Most grapplers have never trained tibial rotation. It's not something conventional gym work addresses, and most mobility programs never get this specific. But if you spend any time in leg lock positions, whether you're attacking or defending, this is one of the highest leverage mobility qualities you can develop.
THE 3-MOVE MOBILITY PROGRESSION
I filmed a full breakdown of this on the Order & Progress YouTube channel this week. The progression has three steps...create the space, load the position, integrate it into movement.
Tibial CARs come first. These are controlled articular rotations for the shin. Slow, deliberate twists that map the full available range of internal and external rotation and begin to open the joint capsule. This is the assessment and the treatment in the same movement.
Shin rolls come next. Once space has been created we start to load it by taking the shin through its rotational range with more intentional pressure and control. This is where the range begins to feel usable rather than just accessible.
Seated shin roll transitions close the loop. This is the integration piece. We move through tibial rotation in positions that mirror what your body actually needs to do on the mat. You're not just mobilizing in isolation, you're teaching your nervous system to use the new range when and where it matters.
FINAL THOUGHTS
Restricted tibial rotation doesn't just affect leg lock defense. It creates compensations that travel up the kinetic chain, affecting your knee, hip, and your overall movement. The body routes around restrictions rather than through them, and those compensations are where injuries accumulate over time.
This simple 3-move warmup will buy you more range but it's not a long-term solution because shin mobility is one piece of a larger puzzle. If you have a restriction in your hip or foot, you likely need to resolve that for lasting changes.
But if you're going to train leg locks, this is a simple and effective way to create more range of motion for better resilience.
Free the shin and you buy yourself more time.
Watch the full breakdown in the link above.
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