Welcome to the forums Sigs, if you keep doing 35km rides one of you will lose some weight.
I've had my bike since December and lost 5 kg so far, all while having a bunch of fun.
If you are ever up the Central Coast way for a ride, give me a yell.
@RobNevyn & @Mountie thanks for the welcome. I'm rather new to Australia (NZ expat) and just learning the trails around Central Sydney. I'd love to head north at some point. Trail forks indicates there are some good trails up around the Central Coast.