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Great question. Just as in any exercise program, moderation is key. Start slowly, build an aerobic base through activities like walking, bike riding, or water aerobics. Add strength training 2-3 times a week to add lean muscle and give your body shape. The more muscle an individual has the faster your metabolism will be.
It's very possible for a woman of any age to be successful on the Rock Your Jeans Challenge. In Rock Your Jeans we strive for a 1-2 lb weight loss a week. That's 8-16 lbs!