I also have all but the 1st of the Biggest Loser
DVDs. They take advanatge of the DVD format and let you pick which
workout you want to do at a given session so that you can customize the length and difficulty. I think that is neat.
They do lots of squats, and the music is lame, but they are also good options considering my limitations.
I have a small trampoline, and sometimes I just put that in the living room and sort of jog in place on it (I think I'd break it if I actually jumped!