My personal favorite muscle-shape-myth is that certain “Butt Exercises” will make your flat butt, round. For years, bodybuilders believed that doing a certain type of Bicep-Curl would add a "peak" to their biceps? This of course, is false. Here’s the scoop on Butt-Exercises: When you look at your naked-Butt in the mirror, 2-FACTORS determines how pleasant - or unpleasant - the reflecting image is:
FACTOR #1 - Genetics: The actual “shape” of your glute-muscles is determined solely by your genetics. Remember, your butt is a muscle, just like your biceps, calves, quads, etc. It’s “shape” is inherent and unique to you specifically. If you train your glute-muscles – like other muscles – it will become stronger and grow, but its shape will not change. In other words, whether you naturally possess a round-type butt or a flatter-version, you probably always will - you’ll just possess a stronger or more developed butt. No matter how much we want this to “not” be true, it just is.
FACTOR #2 - The amount of BODY-FAT on your Butt is the other major factor in determining its physical-appearance. More importantly, this you CAN change. Yes, if and when you reduce the globs of fat on your Butt, curves will suddenly begin to appear.
Look at it this way: If you were to take a granite-statue of a perfectly sculpted human-body, and then, take handfuls of clay and begin to slap it one the statue, eventually the nooks n’ crannies of the sculpted granite would be filled with clay, causing the statue to look more like the “Michelin Man” than a Greek God or Goddess. “Body-fat” has the same effect on your “Butt’s” physical-appearance. It robs your Butt-muscle of some - or all - of its shape, by filling in your muscle’s nook n’ crannies much like the clay added to the statue.
Bottom-Line: If you eat wisely, and exercise intelligently, you won’t be able to ever change the shape of your Butt-muscles. However, the appearance of its shape “will” eventually change.