Ответы и объяснения

09 B Of course, it's not easy to include exercise in your daily routine if you are lazy and spend all day sitting around at home.
10 F Because of the amount of time they spend on the Internet, many of these people are actually doing less exercise then before.
11 C Best of all, you can do so with the support of an online community who have the same aims as you
12 E Others require a large joining fee in order to progress to more advanced activities.
13 A Once you manage to find a more worthwhile website, however, there are real advantages.
14 G Good eating habits are essential for achieving this, particularly if you want your weight to decrease, or increase.
15 D Otherwise it's just too easy to give up, because you've paid nothing and nobody cares if you log onto (or off) the website, or whether you actually do any exercise at all.