24 Hour Fitness Super Sport Upgrade from Sport: extra $10 per month , month to month, no contract and cancel anytime to get back to previous plan, YMMV
After looked at my membership status, $20/year renewal, they offer me to upgrade with an extra $10/month (usually $15/month) with no contract, pay month to month and I can get out anytime to get back to my Sport all club membership.
I didn't take it right away: paying $120 on top of $20 per year might be too much for my budget. But I hope this will help someone as a good deal. And of course YMMV, check your local Super Sport club for more info.