truFlex by Cutera is a muscle-sculpting treatment that uses painless, low-energy pulses of bioelectric current to trigger muscle contractions, which build muscle strength and tone. Formerly known as truSculpt Flex, this noninvasive treatment is FDA-cleared for firming, strengthening, and toning the buttocks, inner and outer thighs, and abdominal muscles.

Other commonly treated areas include the obliques, arms, lower back, quads, hamstrings, and calves.

Each truFlex treatment stimulates up to eight muscle groups simultaneously, versus the one or two muscle groups that most muscle-stimulation treatments are limited to. 

Clinical research shows that truFlex can achieve up to a 33% increase in muscle density after four treatments within a two-week period, along with a modest reduction in fat thickness. Another study found that it may reduce chronic lower back pain (due to having stronger core muscles) and age-related muscle hypertrophy.