I know this sounds really silly but Skipping is fantastic for weight loss, toning up arms especially.
Personally i do not see the point of diets such as Kellogs drop a dress size, slimfast etc, as when you start to eat again it will pile on twice as fast.
How much are you wanting to lose? Just wondering whether you'd be better off learning the basics of something like Slimming World or Weigh Watchers and chanding some eating habits, to drop a dress size. Might help keep the weight of longer??
i lost nealry two stone with SW just before my hols to Rhodes last June, i ate some fantastic foods, never got bored or hungry and only gained 3lbs on holiday (and i was drining wine, ouzo and cocktails, eating greek salads, greek yoghurt and lots of feta cheese

).
I've not followed the plan, or eaten fantastic during my pg but have still only gained 10lbs since falling pg...
Just a thought.