Agreed, and if they offer other LMI classes like Body Balance, Attack, Combat etc. just try them all. As Aboyle says, they are very well structured, sensible (everyone can work at their own pace, there are options for any tricky combos and in pump you will go at the weight you are comfortable with for each track). The music is fabulous - LMI spend a lot of time and money getting permissions to play Top 40 and other current tracks so you'll always have a good soundtrack. I've been going solidly to their classes at my gym in the UK for about the last year and a half and have lost two stone doing a variety of classes. Have fun!