Running?

So i'm thinking about taking up running. It seems like it would be a good and cheap way to get in shape (something i desperately need to do). Also, if I run, i'll be able to have more fun dancing, because I won't get so tired.

Some other benefits of running are that it's free, and it's something I already have basic experience with. Some drawbacks are that it's not necessarily a social activity, and it can be boring. A friend of mine belongs to a climbing gym. There is a climbing gym not too far from my home. Rock climbing is a lot of fun and is social, but in this case isn't at all free.

Of course, i'm happy to hear suggestions from my friends for other fun and inexpensive ways to get in shape. leave a comment if you have an idea!