When your favorite class starts repeating the same music over and over you unintentionally slow down a bit.

You want something new to get your energy up.

Working out to the same music does get boring after a while.
It is the same thing if you are working out at home, your get tired of your own music.

There are several places on the Internet that offers music just for fitness, up beat music to get your energy flowing.

Here are some sites that you can get music from;
The Music and Motion Studio, something for everyone.
Exercise radio, has lots of interesting things including work out podcast classes.
Gf Mix shows the latest releases
Jumpybumpy, they will make you jump!
Solid Sound UK is another great fitness place with music.

With all these options you don't have to worry about listening to the same music twice.
And no more boring work outs!