CharacterArms.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CharacterArms : MonoBehaviour
{
    protected int armIndex = 0;
    public Rigidbody[] arm;
    public Rigidbody chestBody;

    protected float armCounter = 0;
    protected int altarmIndex = 0;
    public float armRate = 0.7f;
    public float armRateIncreseByVelocity = 1f;


    public float liftForce = 4;
    public float moveForwardForce = 30;

    public float holdDownForce = 100;

    public bool attacking = false;

    public void StopAttacking()
    {
        attacking = false;
        armCounter = armRate * 0.99f;
    }

    public void StartAttacking()
    {
        attacking = true;
    }

    void Start()
    {
        StartCoroutine("MoveArm");

    }

    void FixedUpdate()
    {

        Vector3 horizontalVelocity = chestBody.transform.forward;
        horizontalVelocity.y = 0;

        float speed = chestBody.velocity.magnitude;
        horizontalVelocity.Normalize();

        if (armCounter >= armRate)
        {
            AttackMode();
        }
    }

    IEnumerator MoveArm()
    {
        arm[armIndex].AddForce(Vector3.up * liftForce * 15f);

        yield return new WaitForSeconds(3f);

        arm[armIndex].AddForce(Vector3.down * liftForce * 0);

        yield return new WaitForSeconds(3f);

        arm[armIndex].AddForce(Vector3.up * liftForce * 25f);

        yield return new WaitForSeconds(3f);

        arm[armIndex].AddForce(Vector3.down * liftForce * 0);
    }

    public void AttackMode()
    {
    }
}