Array list

At the point when I run the program, it lets me know that my arralist index is somewhere in the range of 0 and 1 beyond the interball. 

public class snake extends Actor {

private head k;
private ArrayList<Rectangle> body;
private Rectangle first;



public Snake() {
body = new ArrayList<>();
k = new Head();
body.add(0, k);
first = new Rectangle((k.width / 2 - 1) * k.dimension, k.height / 2 * k.dimension, k.dimension, k.dimension);
body.add(1, first);


}
public void act() {

for (int i = body.size(); i >= 0; i--) {
body.get(i).moveTo(body.get(i - 1).getCenterX(), body.get(i - 1).getCenterY());

}



}


}

Can someone Tell what's the error i am doing?