Transformed: Week 4, Day 25 - Cardio

Build strength and muscle now, and it will pay off for years—maybe even for a lifetime. Here's how!Back | Main | NextAs your muscles get older, they begin to shrink and lose mass. Additionally, the number of muscle fibers you have begins to decrease. Your bone mineral density also decreases, increasing your risk for falls and fractures. And don't forget your joints, which begin to lose their flexibility because of changes in tendon and ligament structure. Rather depressing, right?But here'