Where can I find a Lunchtime Fitness class in Southend-On-Sea?

Hi,

I work in Southend-on-sea in Essex and I am looking for a Excercise class to do in my lunch break between 12 and 1 or 1 and 2 or whatever time around that.

Does anyone know of anywhere?

lots in yellow pages

http://www.yell.com/super/GYMS/southend-on-sea?sem=y&cam=sem%20_fitness

other listings
http://www.locallife.co.uk/southend/healthandfitness3.asp

http://uk.local.yahoo.com/Essex/Southend-on-Sea/Health_Clubs/uk100004517-s-35375.html?cb=11

Swimming pools often have gyms on site
http://www.yell.com/super/swimming_pools/southend&searchall=1?sem=y&cam=sem%20_fitness
http://www.locallife.co.uk/southend/swimming3.asp

http://www.yell.com/find/s/Fitness/Health-Clubs/UK/Essex/Southend_On_Sea,-Essex

hope thats enough