What should I do to keep my bones strong?

What should I do to keep my bones strong?
Requested by Age2B visitor

by AGE2B

Exercise 30 to 60 minutes most days.
Eat a balanced diet of nutritious foods, including adequate calcium and vitamin D.
Don't smoke cigarettes or use other tobacco products.
Limit the amount of caffeine and alcohol in your diet.
Maintain a healthy weight.
Maintain a healthy posture.
Take steps to prevent falls, such as wearing low-heeled shoes.
Have regular physical exams.
Studies also suggest that tumor necrosis factor (TNF) blockers — sometimes used to treat ankylosing spondylitis — may help maintain or increase bone density in the spine and hip.