Ok so yu absolutelay hate doing aerobics.

Consider doing three rounds of TimeWarp.

You ahve to get the music or tehvideo if Rocky Horror Picture show.
Play teh Timewarp from begining to end.
when RifRaff begins and its slow this is warmup!
the full song with jumps and steaps and arms above head is aerobics! then you will ahve to improvise a cool down.

three rounds of this will get your heart rate up and sweat!

just a thought
julie