Fragile
Osteoporosis is the reduction of the bone density of the bones of the body. This makes bones more susceptible to fracture, and there are a number of factors enhancing the chances of the development of osteoporosis in an individual. These factors include lack of calcium and vitamin D in the diet, genetics, lack of exercise, cigarette smoking, excessive drinking and many more.
No list? Lifestyle factors that people can change to improve their health would be things such as: Physical Training (Physical Activity), Eating a healthy diet, going outside more, etc.
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Answer:
The abdominal muscles
Explanation: The abdominal muscles are located between the ribs and the pelvis on the front of the body. The abdominal muscles support the trunk, allow movement and hold organs in place by regulating internal abdominal pressure.