I want to say that the barbell upstairs squats, with heavy weight and thick thighs. I just squatted for a long time, and then my thighs were particularly strong and my muscle lines were particularly obvious. I am a woman. . . . . . . . . . Then a few days ago, I made a mistake and hurt my muscle. Therefore, the best aerobic fitness equipment for skinny legs and beautiful buttocks is a mountaineering machine or a stair machine. If not, the elliptical machine can persist for 40 minutes every day for a week to see the effect!