In young women with higher body mass index, participating in supervised aerobic exercise three times a week for twelve weeks is associated with an increase in the proportion of muscle mass in the body.

In young women with a BMI between 25 and 27, participating in supervised group aerobic exercise three times a week for 12 weeks leads to measurable decreases in body weight, waist size, and body fat, along with an increase in muscle mass.

In young women with obesity, a four-week program of moderate aerobic and strength training is linked to an average gain of 3.61 kilograms of muscle, while those who did not exercise lost an average of 0.85 kilograms of muscle.

In young women with high body mass index, participating in supervised aerobic exercise three times a week for twelve weeks helps maintain stable body weight, waist size, body fat levels, and blood lipid levels, while remaining inactive leads to measurable increases in these measures.

Working out with weights twice a week for four months can help middle-aged Japanese women build a little more muscle, even as they get older.

In middle-aged women, eight weeks of moderate aerobic exercise was linked to a decrease in muscle mass and fat-free mass, even though overall body weight and fat levels did not change, which may indicate limitations in how the measurements were taken or unmeasured factors like fluid balance or diet.