A square-shaped base could mean many things. Maybe the person has a bit of fat around the love handles, or maybe the person exercises but does not have strong glutes. Some simple core exercises or glute exercises are just the things to reduce excess fat around the waist and make the glute muscles nice and strong.
A circle shape is good and healthy. It also means that there may be some fat storages near the top in the upper part of the glutes. It is easy to remove any extra fat from the bottom if needed.
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