What should i feed houseflies with so they’d be energized enough for strenuous physical activities?

I dont want them to be all jittery, i want them to have enough energy to expend. Im planning to experiment on flies by making them do physical activities ie. Lifting weights, being forced to fly on the same direction as other flies, etc

submitted by /u/throwaway_forposting
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source https://www.reddit.com/r/Entomology/comments/lqc6n7/what_should_i_feed_houseflies_with_so_theyd_be/