Strong Core
The focus on exercise these days is strengthening your core. A strong core will assist in strengthening all the other areas of your body. The core consists of your abs, back and pelvis. Pilates is extremely popular because of its strong focus on core strengthening. It is the most popular among the Hollywood set because of the definition it can produce.
For at home work outs an exercise ball can be a good piece of equipment to invest in. It is not expensive and it can work out every area of your body while focusing on your core. The size of the ball does matter. There are different sizes for different heights. It also should not be overly inflated, you need a little give.