What kind of shakes are you having trouble with? If it is a powder, try mixing it with skim milk instead of water. I used the Pro Performance protein powder from GNC (chocolate caramel). For some reason, that particular flavor wasn't lumpy or thick. I mixed it with skim milk.

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H~330/C~245/G~160

1st 5K: Competed 11-8-08 (39:03)
Official member of LITE (LADIES IN TRAINING through EXERCISE)