Most of the answers have focused on the advantages of a written constitution, and clear disadvantages of an oral/unwritten one. However, the seeds of the disadvantages to a written constitution are also there. For example, it can concentrate greater power in the judicial branch that interprets it, rather than the legislature, which gets to daily decide what the constitution is when it is essentially unwritten.
Time Commitment. A treadmill can help you lose weight and tone all areas of your body, as long as you spend enough time on it. Depending on how rigorous your workout is, plan to spend between one and a half and three hours a week walking, jogging, or running.
Do It Yourself: Treadmill Tune-Up. Treadmills are one of the most popular types of exercise equipment and with good reason -- you can get a great workout without leaving home and without paying for a gym membership. A treadmill is a big investment, though, and you want it to last you a long, long time. The best way to ensure that it does last is to take good care of it. By following a regular maintenance and tune-up schedule, you can keep your treadmill in top condition and avoid the need for costly professional service.