indoor workouts?

[runforfun529]

now that the weather is beginning to get colder, I was wondering if anyone had some great indoor workouts for when its just too cold to run. I'm looking for more than one to add some variety so just post away

 

[ptdirect1]

I love Spin classes! It it a great alternative to running.

 

[billsemail2003]

Anybody have any knowledge of Yoga? Like the kind where they heat-up the room...Does this help the body gain strength? What about Yoga and improvement of my BMI...how does Yoga effect "fat" loss?