diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
similarity index 87%
rename from spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraint.java
rename to spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
index 1f9418402..b538f403c 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
@@ -31,11 +31,11 @@ package com.esotericsoftware.spine;
 
 import com.badlogic.gdx.utils.Array;
 
-/** Stores the current pose for a spring constraint. A spring constraint applies physics to bones.
+/** Stores the current pose for a physics constraint. A physics constraint applies physics to bones.
  * <p>
- * See <a href="http://esotericsoftware.com/spine-spring-constraints">Spring constraints</a> in the Spine User Guide. */
-public class SpringConstraint implements Updatable {
-	final SpringConstraintData data;
+ * See <a href="http://esotericsoftware.com/spine-physics-constraints">Physics constraints</a> in the Spine User Guide. */
+public class PhysicsConstraint implements Updatable {
+	final PhysicsConstraintData data;
 	final Array<Bone> bones;
 	// BOZO! - stiffness -> strength. stiffness, damping, rope, stretch -> move to spring.
 	float mix, friction, gravity, wind, stiffness, damping;
@@ -43,7 +43,7 @@ public class SpringConstraint implements Updatable {
 
 	boolean active;
 
-	public SpringConstraint (SpringConstraintData data, Skeleton skeleton) {
+	public PhysicsConstraint (PhysicsConstraintData data, Skeleton skeleton) {
 		if (data == null) throw new IllegalArgumentException("data cannot be null.");
 		if (skeleton == null) throw new IllegalArgumentException("skeleton cannot be null.");
 		this.data = data;
@@ -62,7 +62,7 @@ public class SpringConstraint implements Updatable {
 	}
 
 	/** Copy constructor. */
-	public SpringConstraint (SpringConstraint constraint, Skeleton skeleton) {
+	public PhysicsConstraint (PhysicsConstraint constraint, Skeleton skeleton) {
 		if (constraint == null) throw new IllegalArgumentException("constraint cannot be null.");
 		if (skeleton == null) throw new IllegalArgumentException("skeleton cannot be null.");
 		data = constraint.data;
@@ -84,7 +84,7 @@ public class SpringConstraint implements Updatable {
 
 	}
 
-	/** The bones that will be modified by this spring constraint. */
+	/** The bones that will be modified by this physics constraint. */
 	public Array<Bone> getBones () {
 		return bones;
 	}
@@ -158,8 +158,8 @@ public class SpringConstraint implements Updatable {
 		return active;
 	}
 
-	/** The spring constraint's setup pose data. */
-	public SpringConstraintData getData () {
+	/** The physics constraint's setup pose data. */
+	public PhysicsConstraintData getData () {
 		return data;
 	}
 
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraintData.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
similarity index 89%
rename from spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraintData.java
rename to spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
index af6f5a910..9f9ad330e 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SpringConstraintData.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraintData.java
@@ -31,19 +31,19 @@ package com.esotericsoftware.spine;
 
 import com.badlogic.gdx.utils.Array;
 
-/** Stores the setup pose for a {@link SpringConstraint}.
+/** Stores the setup pose for a {@link PhysicsConstraint}.
  * <p>
- * See <a href="http://esotericsoftware.com/spine-spring-constraints">Spring constraints</a> in the Spine User Guide. */
-public class SpringConstraintData extends ConstraintData {
+ * See <a href="http://esotericsoftware.com/spine-physics-constraints">Physics constraints</a> in the Spine User Guide. */
+public class PhysicsConstraintData extends ConstraintData {
 	final Array<BoneData> bones = new Array();
 	float mix, friction, gravity, wind, stiffness, damping;
 	boolean rope, stretch;
 
-	public SpringConstraintData (String name) {
+	public PhysicsConstraintData (String name) {
 		super(name);
 	}
 
-	/** The bones that are constrained by this spring constraint. */
+	/** The bones that are constrained by this physics constraint. */
 	public Array<BoneData> getBones () {
 		return bones;
 	}
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
index 8d2154229..f60d8d9e2 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
@@ -55,7 +55,7 @@ public class Skeleton {
 	final Array<IkConstraint> ikConstraints;
 	final Array<TransformConstraint> transformConstraints;
 	final Array<PathConstraint> pathConstraints;
-	final Array<SpringConstraint> springConstraints;
+	final Array<PhysicsConstraint> physicsConstraints;
 	final Array<Updatable> updateCache = new Array();
 	@Null Skin skin;
 	final Color color;
@@ -101,9 +101,9 @@ public class Skeleton {
 		for (PathConstraintData pathConstraintData : data.pathConstraints)
 			pathConstraints.add(new PathConstraint(pathConstraintData, this));
 
-		springConstraints = new Array(data.springConstraints.size);
-		for (SpringConstraintData springConstraintData : data.springConstraints)
-			springConstraints.add(new SpringConstraint(springConstraintData, this));
+		physicsConstraints = new Array(data.physicsConstraints.size);
+		for (PhysicsConstraintData physicsConstraintData : data.physicsConstraints)
+			physicsConstraints.add(new PhysicsConstraint(physicsConstraintData, this));
 
 		color = new Color(1, 1, 1, 1);
 
@@ -150,9 +150,9 @@ public class Skeleton {
 		for (PathConstraint pathConstraint : skeleton.pathConstraints)
 			pathConstraints.add(new PathConstraint(pathConstraint, this));
 
-		springConstraints = new Array(skeleton.springConstraints.size);
-		for (SpringConstraint springConstraint : skeleton.springConstraints)
-			springConstraints.add(new SpringConstraint(springConstraint, this));
+		physicsConstraints = new Array(skeleton.physicsConstraints.size);
+		for (PhysicsConstraint physicsConstraint : skeleton.physicsConstraints)
+			physicsConstraints.add(new PhysicsConstraint(physicsConstraint, this));
 
 		skin = skeleton.skin;
 		color = new Color(skeleton.color);
@@ -188,10 +188,10 @@ public class Skeleton {
 		}
 
 		int ikCount = ikConstraints.size, transformCount = transformConstraints.size, pathCount = pathConstraints.size,
-			springCount = springConstraints.size;
+			physicsCount = physicsConstraints.size;
 		Object[] ikConstraints = this.ikConstraints.items, transformConstraints = this.transformConstraints.items,
-			pathConstraints = this.pathConstraints.items, springConstraints = this.springConstraints.items;
-		int constraintCount = ikCount + transformCount + pathCount + springCount;
+			pathConstraints = this.pathConstraints.items, physicsConstraints = this.physicsConstraints.items;
+		int constraintCount = ikCount + transformCount + pathCount + physicsCount;
 		outer:
 		for (int i = 0; i < constraintCount; i++) {
 			for (int ii = 0; ii < ikCount; ii++) {
@@ -215,10 +215,10 @@ public class Skeleton {
 					continue outer;
 				}
 			}
-			for (int ii = 0; ii < springCount; ii++) {
-				SpringConstraint constraint = (SpringConstraint)springConstraints[ii];
+			for (int ii = 0; ii < physicsCount; ii++) {
+				PhysicsConstraint constraint = (PhysicsConstraint)physicsConstraints[ii];
 				if (constraint.data.order == i) {
-					sortSpringConstraint(constraint);
+					sortPhysicsConstraint(constraint);
 					continue outer;
 				}
 			}
@@ -333,7 +333,7 @@ public class Skeleton {
 		}
 	}
 
-	private void sortSpringConstraint (SpringConstraint constraint) {
+	private void sortPhysicsConstraint (PhysicsConstraint constraint) {
 		constraint.active = !constraint.data.skinRequired || (skin != null && skin.constraints.contains(constraint.data, true));
 		if (!constraint.active) return;
 
@@ -467,10 +467,10 @@ public class Skeleton {
 			constraint.mixY = data.mixY;
 		}
 
-		Object[] springConstraints = this.springConstraints.items;
-		for (int i = 0, n = this.springConstraints.size; i < n; i++) {
-			SpringConstraint constraint = (SpringConstraint)springConstraints[i];
-			SpringConstraintData data = constraint.data;
+		Object[] physicsConstraints = this.physicsConstraints.items;
+		for (int i = 0, n = this.physicsConstraints.size; i < n; i++) {
+			PhysicsConstraint constraint = (PhysicsConstraint)physicsConstraints[i];
+			PhysicsConstraintData data = constraint.data;
 			constraint.mix = data.mix;
 			constraint.friction = data.friction;
 			constraint.gravity = data.gravity;
@@ -686,18 +686,18 @@ public class Skeleton {
 		return null;
 	}
 
-	/** The skeleton's spring constraints. */
-	public Array<SpringConstraint> getSpringConstraints () {
-		return springConstraints;
+	/** The skeleton's physics constraints. */
+	public Array<PhysicsConstraint> getPhysicsConstraints () {
+		return physicsConstraints;
 	}
 
-	/** Finds a spring constraint by comparing each spring constraint's name. It is more efficient to cache the results of this
+	/** Finds a physics constraint by comparing each physics constraint's name. It is more efficient to cache the results of this
 	 * method than to call it repeatedly. */
-	public @Null SpringConstraint findSpringConstraint (String constraintName) {
+	public @Null PhysicsConstraint findPhysicsConstraint (String constraintName) {
 		if (constraintName == null) throw new IllegalArgumentException("constraintName cannot be null.");
-		Object[] springConstraints = this.springConstraints.items;
-		for (int i = 0, n = this.springConstraints.size; i < n; i++) {
-			SpringConstraint constraint = (SpringConstraint)springConstraints[i];
+		Object[] physicsConstraints = this.physicsConstraints.items;
+		for (int i = 0, n = this.physicsConstraints.size; i < n; i++) {
+			PhysicsConstraint constraint = (PhysicsConstraint)physicsConstraints[i];
 			if (constraint.data.name.equals(constraintName)) return constraint;
 		}
 		return null;
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonData.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonData.java
index 0aefa6670..3f107544f 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonData.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonData.java
@@ -47,7 +47,7 @@ public class SkeletonData {
 	final Array<IkConstraintData> ikConstraints = new Array();
 	final Array<TransformConstraintData> transformConstraints = new Array();
 	final Array<PathConstraintData> pathConstraints = new Array();
-	final Array<SpringConstraintData> springConstraints = new Array();
+	final Array<PhysicsConstraintData> physicsConstraints = new Array();
 	float x, y, width, height;
 	@Null String version, hash;
 
@@ -216,20 +216,20 @@ public class SkeletonData {
 		return null;
 	}
 
-	// --- Spring constraints
+	// --- Physics constraints
 
-	/** The skeleton's spring constraints. */
-	public Array<SpringConstraintData> getSpringConstraints () {
-		return springConstraints;
+	/** The skeleton's physics constraints. */
+	public Array<PhysicsConstraintData> getPhysicsConstraints () {
+		return physicsConstraints;
 	}
 
-	/** Finds a spring constraint by comparing each spring constraint's name. It is more efficient to cache the results of this
+	/** Finds a physics constraint by comparing each physics constraint's name. It is more efficient to cache the results of this
 	 * method than to call it multiple times. */
-	public @Null SpringConstraintData findSpringConstraint (String constraintName) {
+	public @Null PhysicsConstraintData findPhysicsConstraint (String constraintName) {
 		if (constraintName == null) throw new IllegalArgumentException("constraintName cannot be null.");
-		Object[] springConstraints = this.springConstraints.items;
-		for (int i = 0, n = this.springConstraints.size; i < n; i++) {
-			SpringConstraintData constraint = (SpringConstraintData)springConstraints[i];
+		Object[] physicsConstraints = this.physicsConstraints.items;
+		for (int i = 0, n = this.physicsConstraints.size; i < n; i++) {
+			PhysicsConstraintData constraint = (PhysicsConstraintData)physicsConstraints[i];
 			if (constraint.name.equals(constraintName)) return constraint;
 		}
 		return null;