I was actually looking into a kick boxing class but it cost the same as what I was spending on T and I wasn't willing to quit (working part time I could only afford one). So, I actually think kick boxing is a GREAT idea!!

Swimming burns a lot of calories and wears you out (you leave hungry and muscles heavy lol) but also relaxing and personally, I'm a big fan of the water.

You could do zumba, aerobics, tae kwon do, bike riding (ooh thats pain for me; especially on hills). I hear running has a lot of burn in it.

I'm kind of out of shape so I can't give you much more haha. But I hope you find some good techniques!