For many people following a weight management regimen, exercise is the biggest challenge. But exercise doesn’t have to be strenuous; it’s just a matter of getting your heart rate up for 30 minutes at a time. Even 15 minutes of increased heart rate can be extremely beneficial. While exercise burns calories, it’s also a terrific way to improve cardiovascular health, increase energy levels, boost metabolism, improves your level of happiness, and may also help reduce stress.