In contrast to strongman or powerlifting competitions, where physical strength is paramount, or to Olympic weightlifting, where the main point is equally split between strength and technique, bodybuilding competitions typically emphasize condition, size, and symmetry. Different organizations emphasize particular aspects of competition, and sometimes have different categories in which to compete.
One of the biggest glutes-toning mistakes people make is relying on weight machines to tone their butts, says Metzl. Instead, try functional bodyweight training exercises like those squats and bridges we mentioned before. These moves are more effective at strengthening the layers of muscle in your glutes, he says—weight machines, on the other hand, isolate a single layer. 
Athletes with relative shortening of the hip flexors and accompanying weakness of hip extensors will exhibit decreased hip extension at terminal stance phase or “toe off.” Athletes who lack hip extension may also exhibit related limitation in great toe extension. Often these athletes will show decreased wear under the great toe aspect of their shoe sole and relative increased wear under the more lateral toes. These athletes may also demonstrate increased hip flexion at initial contact or “heel strike” in an effort to make up for the shorter stride length caused by limited hip extension. In patients with knee instability this will contribute to hyperextension or “giving way” of the knee.13
But how do you actually know if you have weak glutes? A good way to test them is to do a single leg squat as low as you can go, says Brian Schulz, MD, an orthopedic surgeon and sports medicine specialist at Kerlan-Jobe Orthopaedic Clinic in Los Angeles, CA. “Knee flexion to 90 degrees is a good sign that the gluteal muscles are strong enough,” he says.
If the iliopsoas and other hip flexors are tight, they pull down and forward on the pelvis, which tilts the pelvis forward and compresses the lower back. Picture a man standing with the front of his pelvis tilting forward and his tailbone lifting. To stand upright, he has to overarch his lower back. Anatomically, this is called hyperextension; commonly, it's called "swayback." Prolonged standing or sitting in this position increases pressure on the facet joints of the lower spine, which can contribute to arthritis in those joints.
Firstly, let’s establish where your glutes are and what they actually refer to! Your ‘glutes’ — or your gluteal muscles, as they are more formally known — refer to the muscles in your butt. Specifically, there are three major muscles in this area: your gluteus maximus (the main, large muscle that shapes your backside), your gluteus medius and your gluteus minimus (two smaller muscles that assist the gluteus maximus in moving your body).