A higher level of fitness is associated with a longer lifespan, a better quality of life, and decreased risk of stroke, heart disease, and diabetes. There’s never a bad time to start a new exercise regimen, even if you’ve tried and failed in the past. Whether you want to lose weight, increase your overall level of fitness, build strength, or tone what you’ve already got, there’s an app out there that can help you along the way. So here are the best fitness apps we’ve found (in no particular order) for getting in shape with help from your iPhone. 1.