Despite the injuries sustained so far, vice-captain Brown has defended the decision to put so much effort into each session and claims that it is the only way to get England's players into prime condition.
"We need that intensity when we meet up because international rugby is a step up," he is quoted as saying by Sky Sports News. "It's training and things happen. That's what we expect when we go to international camp.
"It puts us in a good place in terms of our preparation for South Africa. We need to make sure the intensity there, and that's the whole point of these camps. It's unlucky people got injured and hopefully they get back on the pitch as soon as possible."
England will face South Africa, Fiji, Argentina and Australia over the next two months.