Frequency is what the answer is. (How Frequent you exercise)
Demography is the study of birth and diseases and it shows the changes in human population. It’s to understand the dynamics of birth, aging of the human cycle.
Legs don’t matter in the sense that it’s not about haveing strength when it comes to being flexible you just have to have really loose muscles in the joints of you’re hips knees ankles shoulders etc
I found it on safari I hope it will help you.
