Move & Restore/header.exercise.php

<?php
    session_start();
?>
<!DOCTYPE html>
<html lang="en" dir="ltr">
    <head>
        <title></title>
        <link rel="stylesheet" href="stylesheet.css">
    </head>
    <body>
    
        <header>
        <nav>
        <ul>
            <li class="logo"><a href="../index.php"><h2>Move & Restore</h2></a></li>
            <li class="dropdown">
                <button class="dropbtn"><a href="../exercises.php">Exercises</a>
                    </button>
                    <div class="dropdown-content">
                    <a href="ankle.php">Ankle and Foot</a>
                    <a href="back.php">Back</a>
                    <a href="elbow.php">Elbow and Forearm</a>
                    <a href="hip.php">Hip and Thigh</a>
                    <a href="knee.php">Knee and Lower Leg</a>
                    <a href="neck.php">Head and Neck</a>
                    <a href="shoulder.php">Shoulder and Upper Arm</a>
                    <a href="wrist.php">Wrist and Hand</a>
                    <a href="wholebody.php">Whole Body</a>
            </li>
            <li><a href="chat/">Live Chat</a></li>
            <li><a href="quiz/">Quiz</a></li>
            <li><a href="journal/">Journal</a></li>
            <li><a href="../signup.php">Sign Up</a></li>
        </ul>
    </nav>

</header>