Probably not (designed to be an athlete). In 'cavemen days' sometimes there would be days where no red meat was available so the 'hunter-gatherer' term is sort of a misnomer and really it was mostly like 'gatherer'...so lots of veggies doesn't equate to much energy I should think...therefore too much rigorous excercise would probably have exhausted early man. These are just presumptions but if you consider the fact that we now have an endless supply of all different food groups at our fingertips and no need to 'store' the energy for times of uncertainty, humans are more able to push their bodies to the limits. Whether this is natural or not is debatable but I would go for the moderate excercise & healthy eating as a way of life...not an obsessive mission to experiment with the shape and size of my body- that would probably put excess strain on the heart.