"I'm too busy"
Between running back and forth between work, social events, and sleep, we lead busy lives. But i don't care how busy we claim to be. We all spend some part of our day doing frivolous tasks. The circumstances under which we can't squeeze 30 minutes to an hour out of our day to spend at the gym are few and far between. Once you add it to your routine, you'll see it will become part of your schedule, and it will reduce the stress that being busy can cause!
"I can't afford it"
The money struggle is real. Bills pile up, money is tight. But when you do the math, you'l realize a gym membership is about the price of a cup of coffee a day. Think about what you spend your money on typically, and weigh the benefits. For such a minuscule amount per day, you're getting access to all sorts of fitness equipment as well as a variety of classes. I'd say it's more than worth it.
"I don't like working out in front of people"
This is a common reason I've heard among friends why they don't want to go to the gym. I get it, it can be uncomfortable at times when you feel like you don't know what you're doing. The good news, however, is that by joining the gym, you'll be surrounded by people who are at all different levels of fitness. So while you sweat it out, there may be others around, but you won't be judged. Also, fitness orientations and training programs are available for those that want some guidance.
So, there you have it. Now, be honest with yourself and get at it!