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Answer:
Missing a little context here, but I'll assume it's a mom talking to a rebellious teen, or similar. (sorry if I got it wrong.)
I would assume that a frustrated mother is talking to a brand new adult that is now refusing to obey their mother. Or something like that. So, she is guilting them by saying how many years of her life she spent on them. All that time she could have spent doing something else, but instead, she invested it in them, and this is what she is getting out of it?
Answer:
Hiking is a powerful cardio workout that can: Lower your risk of heart disease. Improve your blood pressure and blood sugar levels. Boost bone density, since walking is a weight-bearing exercise.
Do you write question is english hou we will understand that