Parent category / child category posts

OK solved!

I have a post called “Cardio” with a child category name “Cardio”.

I created a category-cardio.php (cardio is the child category) but the page doesn’t display the post “cardio” same name as the category.

<?php
/**
 * Cardio category template
 *
 * @package clf
 */

get_header(member);

?>
    <div id="primary" class="content-area">
        <main id="main" class="site-main">

<h1>category-cardio.php</h1>

    <?php $args = array(
        'categroy_name' => 'cardio',    
    ) ?>

    <?php $the_query = new WP_Query( $args ); ?>

    <?php if ($the_query->have_posts()) : ?>

    <?php while ($the_query->have_posts()) : $the_query->the_post();

                echo the_content();

            endwhile;

        endif;
        ?>


        </main><!-- #main -->
    </div><!-- #primary -->

<?php
get_sidebar();
get_footer();