Social influences on fitness behavior mean how your friends and other people around you can affect your fitness goals and choices. For example, if your friends encourage you to go to the gym or go for a jog together, then you might be more likely to do it because those people are important to you. Similarly, if your friends choose unhealthy food, you might start making those same choices because you want to fit in with them. It can also go the other way though. If your friends eat healthy and make good fitness choices, you may start to do the same because you want to be as healthy as them.