Many times airsoft games will go on for at least 30 minutes or more, so if you keep up the pace and stay moving, you will end up getting 30 minutes of exercise. While this may not be as intense as jogging for 30 minutes, or doing pushups etc., it is still a great (not to mention extremely fun) way to burn some calories.

You can also get into good shape by running and jumping around the airsoft course on a regular basis. You will be working more muscles than if you just jogged or ran. And if you are an airsoft sniper, then you will probably be working your arms too, since most airsoft snipers like to crawl around to keep a low profile (and be more stable when they shoot).

Just be sure that you use the proper airsoft gear when playing airsoft. At the very least, you will want to have safety glasses on. However, a full face mask is a much better bet; this will protect your face and your ears, and make it nearly impossible to get hit in the eye. Even with safety glasses on, you can still get hit in the eye if you get shot at the right angle. And getting hit in the eye with an airsoft gun is never a good thing.

If you run around a lot without stopping you can even build your cardio endurance up too, just like with jogging and running. This will help you out for other sports that involve a lot of moving around constantly. You wont get winded nearly as easy when you build up your cardio & endurance. And on top of that, you can become more healthy this way too, and lower your blood pressure etc.

Another obvious side effect of getting into good shape is losing weight. If you need to shed some extra pounds, then playing airsoft can definitely help with that as well. How hard you work and how hard you push yourself is up to you. The harder you push yourself, the more y ou will benefit.