In reply to pebbles:
Just because you might find problems easier by having better core strength, doesn't necessarily mean you will get better core strength by doing those problems - I find that I tend to compensate by using my existing strengths instead.
You need to work on that core strength specifically, by doing problems where you use it, or specific training. The Cafe Kraft book "Get Kraft" had a load of games that you can play, like climbing where you can only use a handing after you have touched it with a foot, or dropping both feet then relaxing them on every single foot movement. These games feel, too me, sufficiently like actual climbing that I actually enjoy it.
Post edited at 08:59