Hi - I have been doing Caroline Girvan workouts for the last 2 months - just upper body as I have knackered my knee. I started on 1 and a half kilos (do not scoff) and have just got up to 4kg. If I can't manage all the reps with the new weight, should I stop or continue with my previous lower weight? I realise these are piddly little fairy weights to some of you on here, but I am really pleased with my progress having done nothing for years. Any advice would be appreciated.