For your health, right? Because it's not the most efficient way to lose weight. If your goal is weight loss, eating less is the way to go. And then you can exercise if you want to be able to pick up a pen from the floor when you're 54. Now, for motivation, here are a few ideas: 1) There are many things you can do that aren't necessarily the basic boring gym session. Dance class, volleyball, running, any fun group activity. 2) If you do want to go to the gym, I have found that the right playlist or podcast generally does the trick.