Your thumb is the only part of your body that has saddle joints. The bones in your saddles joint is responsible for moving back and forth, side to side. These joints are free enough to make any motion in your body. They are the only joints that can do 360 degrees and rotate with their own axis. But, because of its free-moving, it is prone to any dislocation compared to other movable joints.
Basically, your thumb is the only part of your body that has saddle joints. The bones in your saddles joint is responsible for moving back and forth, side to side. These joints are free enough to make any motion in your body. They are the only joints that can do 360 degrees and rotate with their own axis. But, because of its free-moving, it is prone to any dislocation compared to other movable joints.
Explanation:
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Because you could be a mere 100 lbs and still have a high body fat ratio. Transversely, you could weight 300 lbs and have a low body fat ratio. Hope this helped :)