The great thing about indoor climbing is that the routes are all set out for you and given a grade to show how difficult they are. Most gyms in the UK use the French grading system, where the numbers start low for easy climbs and get higher as they get harder. This means you can easily find routes that are right for your ability and see your progress as you start to tackle the harder grades.
Indoor climbing is a brilliant full-body workout and, because you're so focused on the next move, you often don't even realise how hard you're working! It's also a very sociable sport, with a great sense of community in most gyms, but it's just as rewarding if you go on your own to work on your technique.