If you exercise regularly, it’s perfectly reasonable that you might scoff at the idea that something the size of a lime is going to change things. If you’re lucky, it may not.  

However, for the vast majority of us, the prospect of first trimester training is like asking a five-year old Benjamin Button to run a marathon after eating a bad prawn. Having just made it through the first 14 weeks with Number III, the tiredness, tummy troubles and umpteen toilet trips are recent enough that I feel qualified to talk about this (endlessly).