You can add below code where you want in your php file inside :
<?php query_posts(‘category_name=pre-work-out&showposts=10’); ?>
<?php while (have_posts()) : the_post(); ?>
<h3><a href=”<?php echo get_permalink($page->ID); ?>”><?php the_title(); ?></a></h3>
<?php the_excerpt(); ?>
<?php endwhile;?>
This is show what you like in your recent post from your specific category wise. What you like change you “query_post” inside.