I don’t see anything wrong with your query. If the post types exist then is should be working, it’s a pretty simple query. My first step would be to see what posts it’s actually returning to see if I’m getting any of the other posts
$args = array(
'post_type' => array(
'acuaticas',
'dirigidas',
'cuerpomente',
'servicios',
'infantil',
'tonificar'
),
'post_per_page' => 14
);
$the_query = new WP_Query ( $args ) ;
echo '<pre>'; print_r($the_query->posts); echo '</pre>';