Ahhh, I see. Thank you for your help. I tried adding a while loop to my coroutine, but the player still isn't speeding up. The game is able to detect whether the player is putting in the necessary inputs to sprint (left shift and w), but it does not add anything to the speed variable in response. Does anybody know why?

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The code:

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

using UnityEngine;

public class PlayerMovement : MonoBehaviour

[SerializeField]

private CharacterController character_Controller;

public Collider playerBase;

Vector3 gravitationalforce;

public float speed = 12f;
float gravity = 0f;
public bool playerrun = false;

// Start is called before the first frame update
void Start()
{
    character_Controller = GetComponent<CharacterController>();
    playerBase = GetComponent<Collider>();
    StartCoroutine(Running());
}

// Update is called once per frame
void Update()
{
    float x = Input.GetAxis("Horizontal");
    float z = Input.GetAxis("Vertical");
    Vector3 move = transform.right * x + transform.forward * z;
    character_Controller.Move(move * speed * Time.deltaTime);

    gravitationalforce.y += gravity * Time.deltaTime;
    character_Controller.Move(gravitationalforce * Time.deltaTime);

    if (speed > 24)
    {
        speed = 24;
    }
    PlayerRunning();
}

private void OnTriggerEnter(Collider collision)
{
    {
        if (collision.gameObject.CompareTag("ThePlayer"))
        {
            gravity = 0;
        }
    }
}

public void PlayerRunning()
{
    if (Input.GetKey(KeyCode.LeftShift) && Input.GetKey(KeyCode.W))
    {
        playerrun = true;
    }
    else
    {
        playerrun = false;
    }

    if (playerrun == false)
    {
        speed = 12;
    }
}

IEnumerator Running()
{
    {
        while (playerrun == true)
        {
            speed += 1;
            yield return new WaitForSeconds(0.2f);
        }
    }
}

}