The best exercise for your body is a highly disputed topic, but I-Min Lee, a professor of medicine at Harvard Medical School, has several recommendations, found in a Harvard Medical School health report called "Starting To Exercise," reports The Independent. Here are the types of exercises that are best for your body, according to the report: 1. Swimming The authors of the report say, "You might call swimming the perfect workout," because it works every muscle in your body, while getting your heart rate up. Plus, being in water means it's strain-free – making it great for individuals with arthritis.2. Tai chi Tai chi is a Chinese martial art that combines deep breathing, relaxation and flowing movements. According to the National Health Society in the U.K., studies have shown tai chi "can help to reduce stress, improve posture, balance and general mobility and increase muscle strength in the legs.""Tai chi is particularly good for older people because balance is an important component of fitness, and balance is something we lose as we get older," Lee says. 3. Strength training Strength training includes everything from lifting weights to using resistance bands, heavy gardening, climbing stairs, hill walks, Pilates and yoga, cycling and body resistance exercises, such as squats and situps. Doing strength exercises might seem daunting, but they are imperative for healthy aging, as they slow down the rate of bone and muscle loss, help posture, maintain a healthy body weight and flexibility. The NHS recommends you do strength exercises that work all of the major muscles two or more days a week.4. Walking Brisk walking has many health benefits and is a great form of exercise, as it works the lower body muscles, gets your heart rate up and can be a stress-buster. It also helps joint health and is low impact, making it perfect for those who are new to exercising. The team at Harvard recommends beginners start with 10- to 15-minute treks and then build up the intensity and duration to 30- to 60-minute hikes.