You know it. Regular strength-training is essential to keep you looking and feeling young. The more muscle you have, the more calories you burn, even at rest. Strong muscles protect your heart, your joints, your back, and your bones. Whether you're looking for a way to get started or looking for an efficient, effective way to kick your home workout up a notch, this program is for you.

Hollywood trainer Erin O'Brien invites you into her home for a 45-minute routine that works your arms, legs, and core. She combines upper and lower body exercises to keep things moving and get your heart-rate revved. Use hand weights if you have them, soup cans if you don't. If you can't keep up at first, that's great! You have something to work toward—and a healthier, trimmer body to look forward to.

Erin O'Brien has been working as a personal trainer and group exercise specialist for 15 years in elite fitness clubs both in New York City and Los Angeles. She holds several certifications, including one from the Aerobics and Fitness Association of America.

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