Today's exercise strengthens your leg muscles and gives you an energy boost to get through the rest of the afternoon/evening. You can use either two equally weighted hand weights or a pair of full water bottles; however, you can benefit from doing this exercise even if you don't use weights.
Step 1: Stand up and move away from your desk. Your feet should be shoulder-width apart, pointing slightly out.
Step 2: With your arms down straight, hold a weight in each hand. If you don't have weights, clasp your hands behind your head.
Step 3: Bend at your knees until your calves are parallel to the floor, then jump in the air as high as you can. Bend your knees as you land so that your weight is absorbed equally by your knees, hips, and ankles.