iron woman
/ˌʌɪən ˈwʊmən/noun
1Chiefly literary (frequently derogatory ). A woman regarded as hard-hearted or unfeeling; a strong, determined, or unyielding woman.
2A woman who is hardy, robust, or capable of great endurance; now specifically a powerful female athlete, especially one who excels in endurance events.
Origin
Mid 19th century. From iron + woman, after iron man.