diff --git a/data/uking_functions.csv b/data/uking_functions.csv
index f34cbcdd..27dfdad0 100644
--- a/data/uking_functions.csv
+++ b/data/uking_functions.csv
@@ -73704,9 +73704,9 @@ Address,Quality,Size,Name
 0x0000007100d3d40c,U,000144,
 0x0000007100d3d49c,U,000100,
 0x0000007100d3d500,U,000244,
-0x0000007100d3d5f4,U,000016,ActorConstraints::ctor
-0x0000007100d3d604,U,000104,
-0x0000007100d3d66c,U,000104,
+0x0000007100d3d5f4,O,000016,_ZN4ksys3act18PhysicsConstraintsC1Ev
+0x0000007100d3d604,O,000104,_ZN4ksys3act18PhysicsConstraintsD1Ev
+0x0000007100d3d66c,O,000104,_ZN4ksys3act18PhysicsConstraints8finalizeEv
 0x0000007100d3d6d4,U,002256,ActorConstraints::init
 0x0000007100d3dfa4,U,000380,
 0x0000007100d3e120,U,000332,
@@ -82384,7 +82384,7 @@ Address,Quality,Size,Name
 0x0000007100f6a5c8,U,000212,
 0x0000007100f6a69c,U,000092,
 0x0000007100f6a6f8,U,000372,
-0x0000007100f6a86c,U,000020,
+0x0000007100f6a86c,O,000020,_ZN4ksys4phys10Constraint7destroyEPS1_
 0x0000007100f6a880,U,000012,
 0x0000007100f6a88c,U,000160,
 0x0000007100f6a92c,U,000168,
diff --git a/src/KingSystem/ActorSystem/CMakeLists.txt b/src/KingSystem/ActorSystem/CMakeLists.txt
index 5c6a1b47..57acd6df 100644
--- a/src/KingSystem/ActorSystem/CMakeLists.txt
+++ b/src/KingSystem/ActorSystem/CMakeLists.txt
@@ -107,6 +107,8 @@ target_sources(uking PRIVATE
   actInstParamPack.cpp
   actInstParamPack.h
   actLifeRecoveryInfo.h
+  actPhysicsConstraints.cpp
+  actPhysicsConstraints.h
   actPhysicsUserTag.cpp
   actPhysicsUserTag.h
   actPlayerInfo.cpp
diff --git a/src/KingSystem/ActorSystem/actPhysicsConstraints.cpp b/src/KingSystem/ActorSystem/actPhysicsConstraints.cpp
new file mode 100644
index 00000000..7f96a8ad
--- /dev/null
+++ b/src/KingSystem/ActorSystem/actPhysicsConstraints.cpp
@@ -0,0 +1,24 @@
+#include "KingSystem/ActorSystem/actPhysicsConstraints.h"
+#include "KingSystem/Physics/System/physConstraint.h"
+
+namespace ksys::act {
+
+PhysicsConstraints::PhysicsConstraints() = default;
+
+PhysicsConstraints::~PhysicsConstraints() {
+    finalize();
+}
+
+void PhysicsConstraints::finalize() {
+    for (auto*& cs : mConstraints) {
+        if (cs) {
+            phys::Constraint::destroy(cs);
+            cs = nullptr;
+        }
+    }
+    mConstraints.freeBuffer();
+    _10 = false;
+    _11 = false;
+}
+
+}  // namespace ksys::act
diff --git a/src/KingSystem/ActorSystem/actPhysicsConstraints.h b/src/KingSystem/ActorSystem/actPhysicsConstraints.h
new file mode 100644
index 00000000..a093aaec
--- /dev/null
+++ b/src/KingSystem/ActorSystem/actPhysicsConstraints.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <container/seadBuffer.h>
+#include "KingSystem/Utils/Types.h"
+
+namespace ksys::phys {
+class Constraint;
+}
+
+namespace ksys::act {
+
+class Actor;
+
+class PhysicsConstraints {
+public:
+    PhysicsConstraints();
+    ~PhysicsConstraints();
+
+    bool initialize(Actor* actor, sead::Heap* heap);
+    void finalize();
+    void calc();
+
+private:
+    sead::Buffer<phys::Constraint*> mConstraints;
+    bool _10 = false;
+    bool _11 = false;
+};
+KSYS_CHECK_SIZE_NX150(PhysicsConstraints, 0x18);
+
+}  // namespace ksys::act
diff --git a/src/KingSystem/Physics/CMakeLists.txt b/src/KingSystem/Physics/CMakeLists.txt
index 48a5745b..b4f8d18b 100644
--- a/src/KingSystem/Physics/CMakeLists.txt
+++ b/src/KingSystem/Physics/CMakeLists.txt
@@ -18,6 +18,8 @@ target_sources(uking PRIVATE
   SupportBone/physSupportBoneResourceMainBone.cpp
   System/physCharacterControllerParam.cpp
   System/physCharacterControllerParam.h
+  System/physConstraint.cpp
+  System/physConstraint.h
   System/physContactInfoParam.cpp
   System/physContactInfoParam.h
   System/physDefines.cpp
diff --git a/src/KingSystem/Physics/System/physConstraint.cpp b/src/KingSystem/Physics/System/physConstraint.cpp
new file mode 100644
index 00000000..b5752a0e
--- /dev/null
+++ b/src/KingSystem/Physics/System/physConstraint.cpp
@@ -0,0 +1,10 @@
+#include "KingSystem/Physics/System/physConstraint.h"
+
+namespace ksys::phys {
+
+void Constraint::destroy(Constraint* instance) {
+    if (instance)
+        delete instance;
+}
+
+}  // namespace ksys::phys
diff --git a/src/KingSystem/Physics/System/physConstraint.h b/src/KingSystem/Physics/System/physConstraint.h
new file mode 100644
index 00000000..cfb52638
--- /dev/null
+++ b/src/KingSystem/Physics/System/physConstraint.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <prim/seadRuntimeTypeInfo.h>
+
+namespace ksys::phys {
+
+class Constraint {
+    SEAD_RTTI_BASE(Constraint)
+
+public:
+    // FIXME: types
+    Constraint();
+    virtual ~Constraint();
+
+    /// No-op if instance is null.
+    static void destroy(Constraint* instance);
+};
+
+}  // namespace ksys::phys