Hi Ruth,
We're working to improve the way the graphs are presented - at the moment they are a bit mysterious.
On the '3-on-1' page, the
Top line (green) = Weight
Middle line (blue) = Training
Bottom line (orange) = Diet
NB: On all the Diet graph, 'up' is good - i.e. a high diet score means you're eating healthily. On the excercise graph 'up' is obviously good, and for most people on the weight graph 'down' is good.
If you hover your mouse over the points on the graph, you should see a little popup showing the details of your activity.
The reason there's no scale is (I think) to keep your exact figures private when your motivators see the graph. However, that doesn't make much sense when you look yourself, so we're developing some tweaks at the moment.
Hope I've got that all right (!) and that it all makes sense,
Tom (Communities Editor, Times Online)