Please indicate the review count of the "active life" businesses in Phoenix.
active life refers to category_name = 'Active Life'; Phoenix refers to city = 'Phoenix';
SELECT COUNT(*) FROM Categories AS T1 INNER JOIN Business_Categories AS T2 ON T1.category_id = T2.category_id INNER JOIN Business AS T3 ON T2.business_id = T3.business_id WHERE T1.category_name = 'Active Life' AND T3.city = 'Phoenix'