public function getAthleteActivities($before = null, $after = null, $page = null, $per_page = null)
{
$path = '/athlete/activities';
$parameters = array('before' => $before, 'after' => $after, 'page' => $page, 'per_page' => $per_page);
$result = $this->adapter->get($path, $parameters, $this->getHeaders());
return $this->format($result);
}