The best fitness is FUN fitness. If you are not enjoying your fitness routine or excited to get through a workout, than what is fitness to you. You can enjoy it! I promise! If you are currently dreading it, you need to take a look into something else!
One thing to realize is that just because your girlfriend is seeing results from running a few miles everyday does not mean you will too unless you love running as well. You can run every single day and short cut yourself due to the fact that eventually you will not run as hard, as fast and as strong as you should simply because you hate to do it. In time you will see no results and a poor attitude from yourself.
Look inside of you and think to yourself what do I love to do?
Do you like gymnastics? Join a gymnastics studio, cross-fit, mixed martial arts or pole dancing.
Do you enjoy beating someone up or have a ton of stress at work or home? Do you ever just feel the need to hit someone? Make it apart of your fitness routine and try out tae kwon do, jiu-jitsu, karate, boxing, kickboxing, kung-fu, the list is endless.
Love exploring new areas? Get into hiking, biking, rock climbing, surfing, scuba diving all activities that are fun and active. If you travel a lot this can be great because you get the chance to appreciate the nature of an area while sweating up a storm and burning calories!