Do you have a sprint script that, when you press a key, it runs;

Unity Engine
4

Please, next time use code tags, it will be much easier for everyone to read.

I see that you are beginner and don’t really know what tthis whole code means so I think you don’t need to use Assets that are meant for complex applications. I think you should remove Cinemachine and first understand Unity’s main camera. If you want to use 3rd person camera movement, watch this video, it’s really easy to understand:

and this for 1st person movement:

But to answer your question, I will share you my(actually 95% is by Brackeys) primitive code for sprinting

using UnityEngine;

public class Movement : MonoBehaviour
{
    public CharacterController Player;
    public float speed = 12f;
    public float sprintSpeed = 24f;
    public float jumpHeight = 0.5f;

    public Transform groundCheck;
    public float groundDistance = 0.7f;
    public LayerMask groundMask;

    public float gravity = -9.81f;
    public Camera myCam;

    Vector3 velocity;
    bool isGrounded;

    void Update()
    {
        isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);
        if(isGrounded && velocity.y < 0)
        {
            velocity.y = -2f;
        }

        float z = Input.GetAxis("Vertical");
        float x = Input.GetAxis("Horizontal");

        Vector3 move = transform.right * x + transform.forward * z;

        if(Input.GetKey("left shift"))
        {
            Player.Move(move * sprintSpeed * Time.deltaTime);
            myCam.fieldOfView += 0.2f;
            if(myCam.fieldOfView >= 70)
            {
                myCam.fieldOfView = 70;
            }
        }
        else
        {
            Player.Move(move * speed * Time.deltaTime);
            myCam.fieldOfView -= 0.2f;
            if (myCam.fieldOfView <= 60)
            {
                myCam.fieldOfView = 60;
            }
        }

        if(isGrounded && Input.GetButton("Jump"))
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2 * gravity);
        }
        velocity.y += gravity * Time.deltaTime;

        Player.Move(velocity * Time.deltaTime);

    }
}

This is whole code for 1st person movement, spriniting and jumping
If you want just the code for sprinting:

if(Input.GetKey("left shift"))
        {
            Player.Move(move * sprintSpeed * Time.deltaTime);
            myCam.fieldOfView += 0.2f;
            if(myCam.fieldOfView >= 70)
            {
                myCam.fieldOfView = 70;
            }
        }
        else
        {
            Player.Move(move * speed * Time.deltaTime);
            myCam.fieldOfView -= 0.2f;
            if (myCam.fieldOfView <= 60)
            {
                myCam.fieldOfView = 60;
            }
        }

There’s added an effect which raise the FOV when sprinting (just like in minecraft)

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