interesting question as I was thinking about this the other day. I tend to buy chocolate milkshakes the have before the gym, but it doesn't give me the full boost I need, and some of the milkshakes are high in fat, not ideal when you are trying to stay healthy.
my gym sells standard snacks, chocolate bars, crisps etc, but there is nothing available apart from protein shakes that offers a healthy alternative. of course there is cereal bars, but they always seem to be aimed at being low in calories, rather than concentrating on delivering an energy boost.
I would also appreciate any product recommendations, tried and tested by others on this forum.