public function getAthleteBothFollowing($id, $page = null, $per_page = null)
{
$path = '/athletes/' . $id . '/both-following';
$parameters = array('page' => $page, 'per_page' => $per_page);
$result = $this->adapter->get($path, $parameters, $this->getHeaders());
return $this->format($result);
}