Activity — physical activity, that is, IS important every single day for people who’ve entered their senior years. Being sedentary is absolutely the WORST thing any of us should be. But, how much, how often, and how intense should exercise be? Rest and recovery days are every bit as important as exercise days. The American Heart Association states that we need about 150 minutes per week of fairly challenging and purposeful exercise. The US Center for Disease Control agrees with them.