Pagination in WP_Query?

I am using a WP_Query to display posts from within a category and a custom term selected (“fitness visibility” inside category “articles”)

My code:

<?php $catquery = new WP_Query( 'post_type=article&posts_per_page=4&article-visibility=fitness' );
while($catquery->have_posts()) : $catquery->the_post();
?>

    <article class="post home-post">
        <a href="<?php the_permalink(); ?>">
            <div class="post-thumbnail-img">
                <?php the_post_thumbnail('small-thumbnail'); ?>
            </div>
            <h2><?php the_title(); ?></h2>
        </a>
        <p class="post-info">
            <?php the_time('F jS, Y'); ?> |
            <?php get_template_part('block-athlete-archive'); ?>
         </p>

        <p>
            <?php echo get_the_excerpt(); ?>
            <span class="readmore">
                <br><a href="<?php the_permalink(); ?>">Read more &raquo;</a>
            </span>
        </p>

    </article>

<?php endwhile; ?>

Now on my archive pages I use this code for pagination:

<div class="pagination">
                <?php wpex_pagination(); ?>
            </div>

I put it after my “endwhile” and it works.

This is not the case for the WP_Query.

How do I solve this?