WAP inserts the featured image into the content automatically unless otherwise excluded

supress-wap-featured-image-per-page.php

// Add featured image above single posts.
add_action( 'genesis_before_entry_content', 'wap_featured_image' );
function wap_featured_image() {

	// Return early if not a singular or does not have thumbnail
	if ( ! is_singular() || ! has_post_thumbnail() || is_page(36) || is_page(37) || is_page(38) ) {
		return;
	}

	echo '<div class="featured-image">';
		echo get_the_post_thumbnail( $thumbnail->ID, 'feature-wide' );
	echo '</div>';
}