Eat a balanced diet
Proteins, fruits, vegetables, complex carbs, and healthy fats give you a steady source of energy without having to rely on bursts from sugar. Also, drink plenty of water!
Eat about half an hour before exercising
This will give your digestive system enough time to get started, and the blood will start diffusing back to the rest of your body, which avoids cramping. This will help make sure you have plenty of energy.
Get some rest and a massage
This can help keep aches and stiffness from setting in. Keeping your muscles more relaxed will help improve the quality of your workout and better your performance.