Computer-implemented method, system, and apparatus simulate a human/animal body taking a posture. Implementation includes: a) providing a body model (AV), having a skeleton with plurality of bones (b0-b4) articulated by rotational joints (A-D) forming at least one kinematic chain; b) defining a starting position and a starting rotational state for each rotational joint of the skeleton, and a target point position (T), called effector (EF), of an active kinematic chain; c) for at least one rotational axis of each joint of the active kinematic chain, defining: an actuation order, a maximal fractional contribution to a target rotation, and a maximal rotation angle; and d) iteratively applying, to the joints of the active kinematic chain, taken in actuation order, rotations around rotational axes in order to approach the effector to a target position (T). Each rotation of a joint is bounded by corresponding maximal rotation angle or corresponding maximal fractional contribution to the target rotation minimizing the distance between the effector and its target position.