slowpoker/Assets/Scripts/Player/States/Run.cs

using StateMachine;
using UnityEngine;

namespace Player.States
{
    public class Run : State<PlayerState>
    {
        private readonly Player _player;
        private static readonly int AnimRun = Animator.StringToHash("Run");

        public Run(Player player) : base(PlayerState.Run)
        {
            _player = player;
        }

        public override void Enter()
        {
            _player.animator.SetBool(AnimRun, true);
        }

        public override void Update()
        {
            Vector3 velocity = _player.moveDirection * (_player.runSpeed * Time.deltaTime);

            _player.playerRigidbody.velocity = new Vector3(velocity.x, _player.playerRigidbody.velocity.y, velocity.z);
            
            if (Input.GetKeyUp(KeyCode.LeftShift) || (Input.GetAxis("Horizontal") == 0f && Input.GetAxis("Vertical") == 0f))
            {
                _player.StateMachine.SetCurrentState(PlayerState.Walk);
            }
        }
        
        public override void Exit()
        { 
            _player.animator.SetBool(AnimRun, false);
        }
    }
}