The most beneficial type of exercise for improving health in seniors is strength training. This form of exercise enhances muscle strength, improves balance, and increases bone density, reducing the risk of falls and fractures. It supports overall functional mobility, allowing seniors to maintain independence in daily activities. Additionally, low-impact activities like walking and swimming can also provide cardiovascular benefits without excessive strain. A well-rounded fitness program for seniors should include strength, flexibility, and aerobic components for optimal health.