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.
Psoas muscle pain may show up as. 1  groin pain (psoas tendinitis or psoas bursitis) 2  deep pelvic pain, usually on one side, inside, along the hip bone. 3  pain deep in the belly.  lower back pain across the back at waist-level. The lower back pain doesn't come directly from the psoas muscles, but from the posture they cause.