In reply to flopsicle:
> I do find lots of the core ones very hard, the pike in particular, but I can sort of do them and it's a start.
The key thing with all body weight exercises is the concept of progression. If an exercise is too hard there's usually a variant to make it easier. Likewise if an exercise becomes too easy you change it to a modified or different exercise. Some exercises you might not like at all. I tried the pike on a ball and for some reason I just don't like it. Feels like loads of blood is going into my head and is uncomfortable. So I don't do it. There are so many core exercises you can do there's no need to force yourself to do ones you don't like. I think you'll also make better progress by careful choice of the right exercises and focusing on those and doing them really well with good control.
You might find getting a stability ball useful too. For around £6 they're a bargain and can be used in conjunction with suspension training. Here's vid of pike progressions with a ball:
> There's so much free online that I don't want to buy a guide, however I MASSIVELY struggle to remember body positions so really need a pic to work from.
Yeah there's certainly loads online. Personally I find videos much more helpful than photos and words and there is tons of stuff on Youtube. Some is really good, some of it not so good but its all free and a great resource.
As for the ripped barbie look that's more down to losing body fat than anything else.