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.
Your psoas is a large muscle that's attached to vertebrae in your low back on one end and the top of your thigh bone on the other. The psoas, also called the hip flexor, is responsible for flexion in your hip and thigh. A tight psoas muscle can cause problems in your low back and hip area. Performing certain stretches to keep your psoas loose may help you avoid problems.