There are many reasons why you might want to hit the gym. The reason could be that you want to lose weight, be physically active or build muscle. Whatever the reason, you should wear a sports t-shirt to the gym.
You should also agree with this policy of wearing activewear. For example, if you're allowed to wear jeans to the gym, you won't have much right to move. You are limited by your outfit with jeans. But with active clothes, you have free movement. The only thing that will limit you now is your body, ie. you have reached the limit your body allows. You can buy activewear from SOBIKE SPORTSWEAR.
Wearing active clothes will help wick away your sweat. As we all know, when you work hard, you sweat. And when the sweat just can't go away, you hang on and feel uncomfortable. However, if you are wearing activewear, you can remove the secretions as they can absorb sweat.
Hope you understand why you should wear this type of clothing. Basically, it's for your own safety and the gym is trying to protect you too. Also, don't forget to buy the right athletic shoes for your feet. It's usually better to buy classic sneakers as they are more durable and comfortable for your feet.