Summarize the following:
You can do this on the bare floor, but you'll be more comfortable if you use a mat, as it provides a bit of padding. However, avoid doing it on something like a bed, which has too much padding without enough support. Place your arms by your sides and your palms face down on the mat. Bend your knees and place your feet flat on the floor, ready to lift them off in a moment. Take a breath and bring your legs up so your knees are above your hips. They should be bent at 90-degree angle at this point. Then, draw your heels toward each other. Point your toes and push your legs out and up, straightening them out as you do. Make a 65-degree angle with the ground. As you lift your legs, bring the top of your body up, too. Draw your head and shoulders off the ground, bringing your chin down toward your chest. Pretend you're looking at your belly button, and that will help you get in the proper position. Make sure you're tightening your core muscles by pulling your stomach muscles in. While holding your head and legs in the air, move your arms up and down in the air. Keep your arms straight and your palms pointed toward the floor. This movement should be fairly vigorous, as it's meant to get your blood flowing. Aim for moving your arms at least 5 inches (13 cm) up and then down. Breathe in through your nose and out through your mouth. Count out 5 breaths in and 5 breaths out, pumping your arms the whole time you're moving. Try to do 1 pump each time you breathe in and 1 pump each time you breathe out. After 5 breaths, bring your legs and head to the floor to rest. The name of the exercise comes from the fact that you're breathing in 5 times and breathing out 5 times multiplied by 10 to equal a hundred. Technically, you're supposed to pump your arms 100 times, doing 1 pump per inhalation and exhalation.

Summary:
Place a yoga mat down on the floor. Lie down on your back, centered on the Pilates mat. Lift your legs above your hips and then push them straight out. Lift your head and chest. Pump your arms up and down. Breathe in and out 5 times while you pump. Do the exercise 10 times.