Hey - of course you can join, the more the merrier!! Wow, that's an awesome challenge. I am doing Paris marathon next year and I think it's around the same date as the Brighton marathon - Sunday 12th April? Are you new to running? Have you got a training plan for it? My top tips with Slimming World are definitely to plan, plan, plan! Organisation without a doubt helps until you've got your head around it and your head 100% in it. Apart from that don't be afraid to ask questions, your consultant should be able to help or on minis someone always seems to know the answer. Might be useful to set up a food diary in the diary section too to get some feedback on what you're eating and in case you're missing anything.