I can identify obstacles when I know I have to go to the gym and do my routine of exercise. The first one and most dominant is time. Ofen, I set the excuse of "I do not have time because..." And it is just an excuse. And I know that it is not onñy mine, but all my friends have the same excuse.
Another obstacle is laziness. I have to admit. I am lazy. Many times I laid back on my couch playing video games and it is hard for me to have the will to say "stop, go do some exercise..." That is the truth.
A third obstacle is another excuse. "I have homework to do..." And yes, everybody has homework to do, but if you learn how to schedule your daily activities., there would be no excuse to be in the gym on time."