Strava\API\Service\REST::getActivity PHP Method

    public function getActivity($id, $include_all_efforts = null)
    {
        $path = '/activities/' . $id;
        $parameters = array('include_all_efforts' => $include_all_efforts);
        $result = $this->adapter->get($path, $parameters, $this->getHeaders());
        return $this->format($result);
    }