A new study suggests we may soon have a blood test that can tell you what type of exercise is best for you. In a new study published in the journal Nature Metabolism, researchers at Harvard and other medical centers studied proteins normally created throughout the body that start biological processes in other parts of the body. They found 102 proteins that appear to predict people’s physical responses to exercise. Theoretically, measuring your personal protein profile through a blood test could tell you if you would gain a little or a lot of fitness from a certain type of exercise. Until that is available, however, we all need to find some form of exercise that is right for each of us. Because the best type of exercise is the one you actually do.