<p>A new study shows that small bouts of light physical activity are enough to increase lifespan in older men.</p><p>Government guidelines recommended that adults get at least 2 hours and 30 minutes of moderate-intensity exercise every week. However, only about half of American adults actually meet those recommendations, and for older adults, they may seem hard to achieve. But a new report published in the British Journal of Sports Medicine suggests that there&rsquo;s a way to tweak guidelines to make them more feasible for older people, while still maintaining health.</p><p>In the report, researchers looked at about 1,180 men &mdash; average age, 78 &mdash; who agreed to wear devices that measured their movements for seven days. They were followed for about five years. The researchers found that the overall volume of exercise, not necessarily how long or how hard someone exercised in a session, mattered most for longevity.</p>