Dee-
there is a lot of good info out there on strength training. Check out books on the subject or search the internet. It is one of the best things that we can do especially as we get older. Here is some more info that I found on the internet:
Strength Training Adds Bone Mass
Until recently, it was thought that after the age of 30, exercise could only reduce the rate of bone loss. However, the latest research performed at the Human Nutrition Research Center on Aging at Tufts University indicates that strength training at any age can actually add bone, not just slow its loss. Strength training works by applying a force to the bone that creates a stimulus for new bone formation.
In the study, women aged 50 to 70 strength trained twice a week for a year at which time the bone density of their hips and spine was measured. They added about 1%, while the sedentary group had lost about 2.5% bone density. As might be expected, the exercisers also significantly increased their muscle strength.
Strength training can be done anywhere using equipment as simple as dumbbells, rubber tubing and even your own body weight. The American College of Sports Medicine (ACSM) currently recommends strength-training exercise be a component of a well-rounded program for all healthy adults. The ACSM’s recommendation is to perform 8-10 exercises 2-3 times a week, with at least one day of rest between training. One set of 8-12 repetitions per exercise is recommended for general strength training benefits for people under age 50, which will take about 30 minutes to perform. One set of 10-15 reps (more reps performed at a decreased intensity) is recommended for people over 50 or for those with arthritis, previous injuries, or high blood pressure .(If you have any medical condition get your physician's approval before starting a strength training program.)
Remember, building strong bones, especially before the age of 20, can be the best defense against developing osteoporosis and that a healthy lifestyle can be critically important for keeping bones strong. Whatever your age, you need to make deposits into your health savings account today in order to prevent osteoporosis later in life and enjoy an active, physically independent lifestyle.