Star jumps

A quick and easy exercise suitable for beginners; that can be made more difficult for progression if required.
Workout focus:	Heart and lungs, Shoulders and legs
Type of activity:	Endurance
Benefits:	Increased fitness & calorie burn
Time needed:	3 minutes performing continuously
Intensity level:	Varied
Instructions:	Stand up straight with your feet together. Jump up and land with your feet shoulder width apart and, as you do this, lift your arms out to the side. Immediately jump back again and repeat in a continuous manner.
How to make it more difficult:	To make the exercise easier, step out to the side with one leg whilst using your arms. To make it harder, go faster and/or take bigger jumps out to the side.