Casual Babysitter - 3 & 1 yr old

We have two small children (3&1), looking for someone to help with babysitting for approx 8-12 hours a week on a casual basis. Short stints of babysitting to allow me to go to the gym, do food shopping etc. One or two early morning starts for a few hours. No cleaning required but some help to fold the mountains of washing would be appreciated! :)