So you don't want to pay for a gym membership but still want to be in awesome shape...well you came to the right place. I will tell you what to do to achieve a fit body. The more often you work out the higher your metabolism will be. So eat healthy with lots of lean meat, whole grains, fruits, veggies, and dairy, and read the rest of this list.
Next we have pure abdominal videos. Like I previously mentioned though, the first DVDs I suggested were full body workouts and abs was included. Jillian Michaels: 6 Week Six-Pack. If you're looking for pilates moves for abs, try Pilates Intermediate Mat Workout. I have that one specifically, but I would try any pilates Ana Caban videos. She's easy to follow along with, doesn't overexplain, and the workout is good. Overexplaining is a problem I ran into with a lot of pilates videos I tried, expecially the Mari Winsor ones.
I know some people swear by the P90x videos. I however hate working out arms one day, legs the next...etc. I like total body DVDs. But if you're into that sort of thing this is what I'm talking about P90X DVD Workout - Base Kit. The plyometrics video they have is great though I have to admit.
I would also suggest running, walking, and biking to also help you lose the weight and gain lean muscle. Start out doing what you can with the running and slowly add on from there. Or try running as much as you can, then walking a bit, then trying running again. Make sure you breathe when you run (breathe in 2 strides, out 2 strides) and keep your hands relaxed below your heart.
Last but not least get some good workout gear. It doesn't have to be pricey at all! Newbalance shoes are not expensive but do their job expecially if you're doing cardio. New Balance Women's WX623 Training Shoe I've actually picked up newbalance shoes for $25-30 before at TJ Maxx. Asics are also good running shoes. ASICS Women's GT 2150 Running Shoe. I've also picked these up cheaper than they are on amazon. You can find workout pants at walmart even for cheap. If you don't want formfitting pants thats fine, but I find them more comfortable. When you get your body in good shape and are more comfortable with the idea, show your body off. An old cotton t-shirt works just fine to go with the pants. If you're a female you may want to buy supportive sports bras. champion makes great ones. I got mine for $13 each at Target. Champion Women's Double Dry Fitness Bra