To begin your warm-up do 5 minutes of light (low intensity) physical activity such as walking, jogging on the spot or on a trampoline, or cycling. Pump your arms or make large but controlled circular movements with your arms to help warm the muscles of your upper body.
You should get your heart rate up first before a workout. You can get it up by running, or doing jump ropes. Before your workout, stretch your muscles or else they might ache for the next week.