One month family membership for 2 adults and minor children (Under 12) includes classes, pool, equipment, childwatch.  

Y Membership is a great value:

FREE Group Exercise Classes
FREE Getting Started Coaching
Pools at the Berkeley Y and Irvin Deutscher Family Y in Pleasant Hill
Your Membership benefits include:
State-of-the-art cardio and strength equipment
Exercise, educational and group interest programs for the whole family
Convenient drop-in Child Watch while you exercise
Member rates for all additional programs including swim lessons and youth programs
AWAY Program privileges—many of the 2,400 Ys across the country honor your membership

Website: http://ymcacba.org/index.php/locations/ymca-cba-pleasant-hill