i would absolutely join a boxing gym.
here's why:
- there is no better work out for getting fit than hitting a very heavy bag. you will develop your upper body AND lose fat.
- shadow boxing is not as easy as it looks, but as you progress you will get into a flow which is very similar to dancing. i throw in a few dancing moves every couple of minutes when i shadow box, it might look a little funny to some, but hey, im a happy guy, sue me.
- boxing is fun and not boring, unlike staring at the numbers of a cardio machine or fighting with gravity in the gym.
- again, as you progress hitting the bag will likely give you a euphoric feeling similar to a "runner's high" which will hopefully make you stick with it. hence, results!
- the kick your future wife will get from telling all her friends about you boxing (roar!) is uncomparable.
if boxing interests you ask me to elaborate on a program.