I always make my pre workout shake like my post workout shake, but about 1/3 to 1/2 the size. So one scoop of whey (25g) and 20-30g of dextrose/maltodextrin. Taken 30-40 min prior to lifting.

you can go with a bannana as pity suggested, but i would still add carbs to the shake, although maybe a little less like 15g - 20g or so.

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