Between gas prices, membership fees, travel time, waiting in line to use equipment and, ugh, sharing showers with strangers, going to the gym is quickly becoming more of a hassle than it's worth. It takes so much time out of your day and costs extra money for what, because it has a nice atmosphere? Building a home gym or workout space will give you back the freedom and time during your day to fit fitness flexibly into your schedule while saving you money in the long run. No more rubbing elbows with sweaty, stinky people when you can relax in the comfort of your own home and achieve the same results.
The first things you should look into purchasing are the ones you will have trouble maintaining your healthy workout without. That doesn't mean you have to scan the papers for boxing bags for sale before anything else, you just have to set aside some time later to look for things like boxing bags if they're essential to your workout. Look for natural things in your home that can save you money as well. Skip the stair stepper machine if you actually have stairs in your home. Skip free weights or medicine balls if you happen to own a couple of old bowling balls (which can likely be found at a garage sale cheaper than you could find them in a store).
The most important part of building your home exercise space is the space itself. You want it to be somewhere that you can relax and stretch before and after your workout. If space allows, bring in some mats and work out a home yoga routine. In your personal gym, you call the shots about what stays and goes. Stop paying for services you don't need and tailor your home workout to your needs without wasting money on traditional gyms.