Want to do weight training but can't afford a gym membership? Exercise weblog Sandbag Fitness provides daily workout routines, video guides and more using nothing more than sandbags.
Of course in addition to all the helpful free materials there ads to purchase the author's book on sandbag fitness ($US15) and specially designed fitness sandbags ($US125+). If you get a regular sandbag and fill with play sand from a home improvement store, you should be able to have everything you need to use the fitness plan cheaply.
These types of workouts are not for everyone, but if DIY exercise equipment seems like a good idea to you I'm sure you'll get a kick out of the videos and workouts at the source link below.