i went to sports central fore 3-4 months a while ago. I went around 11pm - 12am and place was a shithole. Smells like shit and brown jerks everywhere who they think they are big (but they aint) and pinner hongers/fobs who wear flip flops
if u still want to go to a community centre gym, go find an empty one that has updated equipment and is not located near any high school.
edit: hillcrest is surprisingly not as packed as i thought it would be in the recent times i went there. I go to creekside near science world as well but place is small but has two olympic platforms for DL and very very very few people was

once with everything to myself at 6pm