I've got 3 of the 10 Minute Solution ones (cost about �4 each on play.com, I think). Good because if you don't have much time you can do small segments and if you have more you can run them together; each one targets something different (Ab Attack, Interval Burn etc.). I have Target Toning, Carbs and Calories and Fat Blasting Dance Mix. Only caution is you might not want anyone to see you doing it as you can look a bit stupid. but this is also a problem with the gym!