Arnlod has admitted to useing setorids. Its not like its a big theory that if he used them, in sevaral inteviews he admitted to using them. And really you do loose some muslc mass, it largely demandson your diet. If you eat right you can pretty much maintain the bulk of your muscle mass even if you are a coach potato however example me after about 2 weeks of not working out I go back to the gym my weights are always lower granted its much easier to fly back up.
IDC what arnold looks like anyways.
Frankly weights are great, running etc are too hard! There is this old man on a weight lifting forum he is 72 years old and has been at weights since he was 17 granted his weights today are much lower then what they used to be but he is still pretty buff. So if it becomes al iftime hobby you never have the problem.