Aromatase inhibitors belong to an even broader class of drugs known as antiâestrogens. The other subcategory of drug under the anti-estrogens category is known as selective estrogen receptor modulators (SERMs), such as Nolvadex and Clomid. AIs and SERMs make up anti-estrogens.
Improve it: The only way to strengthen a weak psoas is by bringing your knee above 90 degrees. Sit with your knees bent on a low box or bench (6 to 10 inches high) (3). Maintaining good posture and keeping your abs tight, use your hips to raise one bent knee slightly higher than your hips.
Benefits. Here is a list of the most important advantages (details for the general benefits of stretching can be found here) that a psoas/iliopsoas stretching routine can render: 1  It prolongs muscle fibers, improving your motion range and allowing for effortless mobility of your hips and thighs.