3-4% and 6-7% are competitive bodybuilders who would have fasted from carbs and water for a solid 5-7 days.
It's impossible to maintain that level of vascularity. The 3-4% is pre-show and the 6-7% is for a fitness photoshoot, however, they would both be so dehydrated that they'd be on the verge of fainting. Give them each 2L of water (that's how thirsty they'll be) and a meal and they'd have the most incredible physiques.
For example the difference between these two photos would probably only be like a week:
When bodybuilders compete on stage, that's when they're at their weakest. They have no energy because they haven't had carbs or drunk water in days. I work with a bodybuilder who put on 15kg in a day and a half after one of his shows, just by having a cheat day and restoring all his water levels.
It's really interesting. The DailyMail aren't a credible bodybuilding site, but this was actually really interesing:
http://www.dailymail.co.uk/health/ar...k-nothing.html
