I would recommend the 8 week fitness blender http://www.lulu.com/shop/kelli-segars-and-daniel-segars/fitness-blenders-8-week-fat-loss-program-to-lose-weight-tone-up-fast/ebook/product-20134918.html you pay for the programme (like ?3) but all the workouts are free; http://www.fitnessblender.com/ Or any of the Gillian Michaels dvd's, my current fave is '30 day shred', its 3 levels of 20 min work outs so you can fit in anytime or combine 2 levels (or all 3 for the brave) to make a longer workout