Indoor Training Facilities in SoCal?

I know the rain has stopped... for now...

But for future rainy days...

What are good indoor training facilities in and around LA/OC? (can include SD if you wish... I just don't know SD much)

Criteria:
- INDOOR excluding arena turf fields which I know there are many but they're not indoors...
- ABLE TO DROP IN without having joined a league or something... as a one-off session during a rainy day...
- can be FUTSAL, PRIVATE, GROUP, PICKUP, AGILITY/ATHLETIC

I'll update the list below as...

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