Our expert says:
I would certainly agree with both Diet Doc and the instructor, because you are very light, in fact you are underweight. I also think therefore that you can continue training, but you need to change the focus of the training to tone and improve fitness, rather than weight loss. HOwever, I think that diet is as important, and while I could not find your question on the site, I know what Diet doc would be saying. Firstly, and I've said it already, you are seriously in danger of slipping into serious problems being underweight, and I think that diet is a very important in this regard. It's really hard to pinpoint exactly what you can change, because I know nothing of your diet.
As for exercise, you are not training excessively so that is a good thing, and I would suggest that you continue with it. For toning, the only thing you would add is extra weight training, on the resistance machines in the gym. What I would suggest is that you check out the following website:
Here you will see a number of options for training programmes. My advice would be to choose the Shape up for Summer programme (the first or second one) and then use this programme to get ideas for resistance training. I think that if you follow the general principles of this training programme, you will find ways to tone.
FInally, you said there was a lot of dieting, and I really urge you not to go back to this - you don't need diet and into the future, you must just continue to eat a healthy diet (don't undereat) and exercise regularly, but not excessively.
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