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.
On the other hand, if the back of your leg is tight and you canât bring your leg to the 90-degree point, the psoas contracts the entire time you hold your leg up, even if you have a strap wrapped around your foot. By definition, this is an isometric contraction: the muscle is working, but not changing length.