While it is realized that older adults can benefit from engaging in cardiovascular, strength, flexibility, and balance training, any single type of exercise seems to not be sufficient to improve all fitness parameters together. Compared to performing only one type of activity, well-rounded physical activity programs that include a combination of aerobic, resistance, flexibility, and balance activities may be more effective in improving fitness and providing meaningful functional outcomes for older adults. Therefore, the development and implementation of safe and effective well-rounded activity programs in community- and home-based settings is an effective means by which older adults can achieve the many benefits of engaging in regular physical training. This lecture will review the benefits of, and recommendations for, physical activity, and the existing body of knowledge regarding specific cardiovascular, flexibility, strength, and balance interventions shown to improve health and function in older adults who are healthy or frail. In addition, this lecture will discuss aspects of behavior change to improve adherence and key practices for promoting physical activity in older adults among medical, clinical, and fitness professionals, as identified by the American College of Sports Medicine.