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.
For a runner averaging 180 strides per minute, the left and right psoas each contract and lengthen more than 5,000 times during the course of an hour run. That's a lot of strain on a band of muscle that's only about as thick as your lower forearm. The psoas also promotes good posture. Along with a coordinated team of core muscles--abs, obliques, lower back--the psoas helps stabilize your midsection and pelvis. Every time you stand, walk, or run, you're engaging the psoas.